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000-516 - DB/2 Administration for OS/390 - BrainDump Information

Vendor Name : IBM
Exam Code : 000-516
Exam Name : DB/2 Administration for OS/390
Questions and Answers : 118 Q & A
Updated On : December 14, 2018
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000-516 exam Dumps Source : DB/2 Administration for OS/390

Test Code : 000-516
Test Name : DB/2 Administration for OS/390
Vendor Name : IBM
Q&A : 118 Real Questions

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IBM IBM DB/2 Administration for

IBM facts Studio | killexams.com Real Questions and Pass4sure dumps

This chapter is from the publication 

IBM statistics Studio is blanketed in each DB2 version. IBM facts Studio provides a single integrated environment for database administration and application development. that you could operate projects which are regarding database modeling and design, setting up database applications, administering and managing databases, tuning SQL performance, and monitoring databases all in one single device. it's an excellent device that can enormously benefit a crew ambiance with distinct roles and duties.

IBM records Studio comes in three favors: full client, administration customer, and net console.

the full customer contains both the database administrative and the software development capabilities. The development ambiance is Eclipse-based. This presents a collaborative development environment via integrating with other advanced Eclipse-primarily based equipment similar to InfoSphere information Architect and InfoSphere Optim pureQuery Runtime. be aware that some of the advanced InfoSphere equipment are most effective covered within the DB2 superior editions and the DB2 Developer edition. that you may also separately buy the superior tools.

The administration customer is a subset of the full client. It nevertheless offers a wide array of database administrative performance similar to DB2 illustration administration, object management, facts management, and question tuning. fundamental utility construction initiatives such as SQL Builder, question formatting, visible clarify, debugging, modifying, and running DB2 routines are supported. Use the entire client for advanced application development features.

The web console, because the name implies, it is a web-based browser interface that offers health monitoring, job administration, and connection management.

IBM records Studio Workspace and the assignment Launcher

when you've got correctly put in the IBM statistics Studio, you are requested to give a workspace identify. A workspace is a folder that saves your work and tasks. It refers back to the laptop development ambiance, which is an Eclipse-primarily based concept.

project Launcher is displayed, which highlights right here class of initiatives:

  • Design
  • boost
  • Administer
  • Tune
  • video display
  • each category is described in additional aspect in its own tab. click any tab, and you see the key and first projects listed in the field on the left. See determine 4.26 to get an idea on how to navigate the assignment Launcher.

    as an instance, the determine shows you the strengthen initiatives. that you may locate the key construction projects on the left. On the suitable correct, it lists more projects regarding construction. On the backside correct, IBM facts Studio provides a few documentation hyperlinks the place that you could be taught more about building. the place acceptable, it also suggests the advanced equipment attainable within the InfoSphere Optim portfolio that follow to the assignment you have got chosen.

    Connection Profiles

    every assignment you were to operate towards a database requires to first establish a database connection. To connect to a database from IBM information Studio, open the Database Administration perspective. On the proper correct nook, click on the Open viewpoint icon and select Database Administration.

    On the Administration Explorer, right-click on the white area or under the brand new menu, choose New Connection to a database. From the new Connection window, you see so you might use the IBM records Studio to hook up with diverse IBM data sources, as well as non-IBM information sources. select the database manager and enter the integral connection parameters. determine four.28 indicates an illustration.

    Figure 4.27

    figure 4.27 Open the Database Administration viewpoint

    Pull down the JDBC driver drop-down menu, and you'll choose the type of JDBC driver to use. JDBC class four driver is used through default.

    Use the test Connection button to be sure the connection suggestions you enter is legitimate. click on conclude.

    At this factor, you have got created a connection profile. Connection profiles include assistance about how to connect to a database reminiscent of indicating the category of authentication to be used when connecting the database, specifying default schema, and configuring tracing alternatives. different group members can import the connection profiles to their own IBM records Studio and be in a position to deploy a collection of consistent connection settings.

    To replace the connection profile, correct-click on the database and choose homes. residences for the database are displayed as proven in determine four.29.

    ordinary Database Administration equipment

    There are few other advantageous administration initiatives purchasable within the menu illustrated in figure 4.29.

    The control Connection characteristic allows for you to rename the connection profile, delete the connection profile, trade the consumer identity and password, and reproduction the profile. The lower back Up and restore function makes it possible for you to setup a database or table area backups. within the acceptable editor, which you could specify the type of backup, area of the backup photos, and performance options for the backup. Database backup and recovery is mentioned in Chapter 10, “conserving, Backing Up, and improving facts.”

    The install and Configure characteristic permits you to configure the database. Database configuration and this IBM information Studio feature are covered in aspect in Chapter 5. notice from the menu, you could launch the Configure automatic protection editor. DB2 offers computerized protection capabilities for performing database backups, reorganizing tables and indexes, and updating the database records as fundamental. The editor allows you customise the automated maintenance coverage (see determine 4.30).

    Figure 4.30

    determine four.30 select the computerized maintenance policy alternate options

    The control Database function enables you to delivery and forestall the database. In DB2, that ability activating and deactivating the database. Activating a database allocates the entire vital database memory and functions or strategies required. Deactivating a database releases the reminiscence and stops DB2 capabilities and processes.

    The monitor characteristic launches the IBM data Studio net Console. discuss with the section, “IBM information Studio internet Console,” for introduction of the device.

    The Generate DDL feature makes use of the DB2 command-primarily based tool db2look to extract the data Definition Language (DDL) statements for the recognized database objects or the complete database. This function and power come effortless if you happen to wish to mimic a database, a collection of database objects, or the database statistics to yet another database. as a result of the Generate DDL characteristic in IBM statistics Studio or the DB2 command db2look, you get hold of a DDL script. The script includes statements to re-create the database objects you have selected. See determine 4.31 for a reference of the forms of statements that you would be able to generate using the IBM records Studio.

    Figure 4.31

    figure 4.31 Generate DDL characteristic within the IBM statistics Studio

    For finished alternate options for the DB2 command db2look, refer to the DB2 counsel middle.

    The start Tuning function configures the database to permit query tuning. You may receive a warning indicating that you deserve to prompt the InfoSphere Optim question Workload Tuner (OQWT) license for superior tuning skill. word that IBM DB2 advanced business Server version comes with OQWT. follow the guidance to apply the product license or click on sure to configure the database server for tuning with the features complementary in the IBM information Studio.

    When the database is configured to use the tuning advisors and tools, you're presented with the query Tuner Workflow Assistant, as shown in determine 4.32.

    From the question Tuner Workflow Assistant, you could acquire an announcement from quite a lot of sources and tune the remark. in the capture view, it gives you a listing of sources the place you can trap the statements. figure four.33 suggests an illustration on capturing the SQL statements from the equipment Cache. This illustration captures over one hundred statements. correct-click the statement in which you have an interest and choose demonstrate SQL commentary or Run Single-question Advisors and tools on the selected remark.

    Run the question advisors and equipment on the chosen observation. that you would be able to now enter the Invoke view. The device collects information and information and generates a data access plan (see determine 4.34).

    When the question tuning actions are finished, you are brought to the overview view. It presents you the analysis results and an guide recommendation, such because the one shown in determine 4.35. The tool documentation recommends gathering and re-accumulating all of relevant information of the query.

    you can also evaluate the entry plan graph generated with the aid of the DB2 explain function (see determine four.36 for an illustration). be aware to shop the analysis for future references and examine them if essential.

    The manage Privileges characteristic allows you to furnish database privileges to the clients. discuss with Chapter 8, “enforcing security,” for details about privileges and database access controls.

    normal Database development equipment

    IBM records Studio consolidates the database administration and database building capabilities. From the assignment Launcher – strengthen, you locate a list of key development projects reminiscent of developing and running SQL statements, debugging saved processes, and user-defined capabilities (UDFs). each project brings you to a device that helps you accomplish it.

    SQL and XQuery Editor

    The SQL and XQuery editor helps you create and run SQL scripts that contain more than one SQL and XQuery statements. To launch the editor, open the facts project Explorer; under SQL Scripts choose New > SQL or XQuery Script. As shown in determine four.37, a pattern SQL script is entered. that you could configure the run options for the script.

    The editor codecs the SQL statements nicely and offers syntax highlights for more convenient analyzing as you enter the SQL statements. The performance content material aid is additionally very positive. It lists the entire current schemas within the database so so that you can simply select one from the drop-down menu. The editor also parses the commentary and validates the statement syntax. that you can validate the syntax in scripts with distinct database parsers and run scripts against varied database connections.

    SQL question Builder

    The SQL query Builder allows for you to create a single SQL commentary, but it surely does not help XQuery. because the name implies, the device helps you build an SQL commentary. It helps you look at the underlying database schema or build an expression, as shown in determine four.38.

    Database Routines Editor and Debugger

    kept tactics and consumer-defined services (UDFs) are database utility objects that encapsulate software logic at the database server in preference to in software-level code. Use of application objects support cut back overhead of SQL statements and the consequences which are handed during the community. saved processes and UDFs are also called routines. IBM facts Studio helps routines building and debugging.

    From the records venture Explorer, create a new statistics building challenge. in the assignment, that you can create various styles of database utility objects similar to kept techniques and UDFs (see figure 4.39). To debug a pursuits, appropriate-click on the activities and choose Debug.


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    IBM can be at another turning element in its storied heritage. In October, the business announced it was for $34 billion in its largest tech deal ever. IBM is also investing $1 billion in initiatives like apprenticeships to educate worker's for what it calls "new collar" jobs – a phrase coined via IBM president and CEO Ginni Rometty for staff who have expertise competencies but now not a 4-year school degree.

    "I think it really gets at probably the most largest issues of our time as a result of these new technologies are terrific, they're going to resolve many complications… however they additionally create a huge digital divide – just about a have and haven't," Rometty mentioned Tuesday on "CBS This Morning." 

    "americans often talk about jobs being removed via [artificial intelligence]. I in fact feel of it as jobs are going to be one hundred percent changed by way of AI. So each and every of us is going to work with AI somehow of doing our job."

    The "new collar" jobs might latitude from working at a name center to establishing apps or fitting a cyber-analyst at IBM after going through a P-TECH (Pathways in technology Early school excessive school) program, which takes six years beginning with excessive college and an affiliate's degree.  

    "there's bit of a method. it is, company gives the faculty and helps with the curriculum, mentors, internships, and we now have obtained 550 corporations assisting along with IBM all over this country right now," Rometty noted.

    requested about the Trump administration's tax guidelines, Rometty mentioned it turned out to be a "tax headwind" for IBM.

    "but we were a strong supporter of it as a result of for the long run, it is in reality the right issue to do. however even in this type of envelope and the place the world is at the moment, we nevertheless see superb opportunity accessible. And as I stated, what we have finished, we now have made a dedication around helping retrain 100,000 americans in this economic climate for jobs both at IBM and in different places that can basically work during this new period."

    IBM CEO Ginni Rometty: Tax code is "uncompetitive" and "obsolete"

    flow CBSN, a 24/7 reside news channel from CBS information for free.


    internal IBM's records Server supervisor and other database efficiency equipment | killexams.com Real Questions and Pass4sure dumps

    IBM presents a few database efficiency equipment, including IBM information Server supervisor, which is an integrated database management platform for DB2 databases. DBAs can use it to monitor performance, music configuration alterations, administer databases, and proactively or reactively optimize their database environment the usage of one built-in, conclusion-to-end tool.

    facts Server supervisor's capabilities differ for DB2 for LUW and DB2 for z/OS. When managing DB2 for z/OS, database directors can use IBM statistics Server manager Base edition V1.1.2.1 to join and operate base operations. The product additionally integrates with DB2 question Workload Tuner for z/OS for superior question tuning and with the DB2 Utilities answer Pack for z/OS for configuration management.

    information Server supervisor allows DBAs and different IT gurus to auto-discover DB2 for LUW databases by means of instance, in addition to predefined, customizable performance thresholds and alerts. Its enterprise dashboard can scale to show metrics for lots of of databases. This includes true-time and historic performance data in addition to specified metrics for SQL statements, locking, workload, reminiscence, I/O and storage. Its constructed-in wise alert detection offers brief identification of poorly performing queries, missing indexes and buffer pool hit ratios.

    The product additionally offers advisors and access plan graphs that provide thoughts and evaluation for tuning poorly performing statements or workloads, together with indexes, data and optimizations. It also allows DBAs to analyze storage access patterns for potential storage discount rates.

    The platform become designed to be business-competent, with the skill to control hundreds of databases. It runs through a browser and may be install on a computing device, on the facts server being monitored or on a separate laptop. Nothing else has to be installed on the information server being managed.

    IBM statistics Server supervisor licensing, pricing and support

    statistics Server supervisor comes in two variations: the bottom version is included with DB2 for LUW specific, Workgroup and commercial enterprise versions. The enterprise edition is protected with DB2 for LUW superior commercial enterprise and DB2 for LUW superior Workgroup variants. The commercial enterprise version can even be delivered to the non-advanced editions with the performance management providing for DB2 for LUW.

    For DB2 for z/OS, the statistics Server supervisor Base edition is free for down load from IBM DeveloperWorks. DB2 question Workload Tuner for z/OS and DB2 Configuration supervisor for z/OS (part of DB2 Utilities solutions Pack for z/OS) are one after the other priced add-ons.

    assist is equipped as a part of the DB2 for LUW guide with the aid of DB2 edition.

    further IBM database performance tools

    IBM statistics Studio is an Eclipse-primarily based platform for database administration and performance management that can also be used for DB2 for LUW and DB2 for z/OS. like the IBM information Server manager, a number of of the SQL question tuning and performance equipment can also be accessed and used within the facts Studio product.

    The IBM DB2 performance answer Pack for z/OS is an built-in set of database efficiency tools that allow DBAs to determine, diagnose, clear up and prevent performance problems in a DB2 for z/OS atmosphere. The solution pack contains here software:

  • IBM Tivoli OMEGAMON XE for DB2 performance professional on z/OS, which is a database gadget efficiency video display for DB2 for z/OS databases and functions. IBM also presents OMEGAMON displays for z/OS, IMS, CICS and other device utility.
  • IBM DB2 question monitor for z/OS, which is a SQL monitoring and tuning device for tracking and picking poorly performing SQL.
  • IBM DB2 SQL performance Analyzer for z/OS, which gives the capability to research the efficiency of SQL queries while not having to execute them.
  • IBM InfoSphere Optim query Workload Tuner for DB2 for z/OS, which -- as outlined above -- displays and tunes SQL workloads in response to skilled suggestions.
  • For DB2 for z/OS, the REORG and RUNSTATS utilities, which might be used to accumulate facts about DB2 statistics and reorganize desk areas and indexes, are available from IBM as part of the DB2 Utilities answer Pack for z/OS.
  • For DB2 for LUW, IBM presents the IBM DB2 efficiency administration providing, a group of equipment to computer screen, manage and increase database and application performance. available for DB2 business Server version, DB2 Workgroup Server version and DB2 express Server version, the DB2 efficiency administration offering helps DBAs establish problems and get hold of notifications of degrading performance or rising resource bottlenecks. This lets them diagnose the foundation reason for concerns and isolate issues across functions, networks and databases, and to clear up efficiency complications the use of tuning options for a complete workload.

    IBM InfoSphere Optim pureQuery Runtime, which is accessible for each z/OS and LUW, provides an information access platform that can improve performance, security and manageability of database client functions. It uses a runtime atmosphere and an API that enhances the performance of present in-condo functions while not having to regulate them.

    Contact IBM for suggestions on the a considerable number of product bundles and pricing for its database performance tools.




    Killexams.com 000-516 Dumps and Real Questions

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    000-516 exam Dumps Source : DB/2 Administration for OS/390

    Test Code : 000-516
    Test Name : DB/2 Administration for OS/390
    Vendor Name : IBM
    Q&A : 118 Real Questions

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    DB/2 Administration for OS/390

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    DB2 Security with All the Trimmings | killexams.com real questions and Pass4sure dumps

    DB2 Security with All the Trimmings

    At a major New England-area insurance provider, a database engineer who asked not to be identified in this article, describes the management of security for her mainframe databases as "a nearly-impossible, labor-intensive task - if all we had to use were IBM's own security administration utilities."

    She reports that her company has over 600 IBM DB2 databases running in 13 LPARs across eight mainframes distributed across two, geographically separate data centers.

    "About 8,000 end users at the company have controlled access to the literally hundreds of volumes of DB2 data on systems which we are migrating to DB2 version 5.1. We are also in the process of migrating from [IBM] MVS to the OS/390 operating system to achieve Year 2000 compliance," says the engineer.

    "While IBM did a great job with DB2, its security administration tools are inadequate to keep up with the changes that occur in our environment on an almost daily basis: changes in user access, the maintenance of object security and the securing of access to new transactions. Our database administrators (DBAs) would be spending all of their time just doing security work if all we had were DB2's own security utilities. It is just not an option not to have a second [security] administration package for DB2."

    To enhance the security administration capabilities delivered with IBM DB2, the engineer reports that her company uses RC/Secure from Platinum Technology Inc. (Oakbrook Terrace, IL). With RC/Secure, she says, "We can let our security administration personnel do the busywork of [granting and revoking access to DB2 database objects], while letting the DBAs focus on the intelligence work of database design. Platinum's product provides for cleaner security operations and productivity improvements over native DB2 security applications."

    In DB2's defense, the engineer concedes that her company has not looked closely at any changes in DB2 security delivered with the new version of the IBM database. Platinum's RC/Secure has become a fixture at the company over a period of years and she has little incentive to change something that works.

    DB2 Security: An Opportunity to Enhance

    IBM, which has delivered DB2 since its branding in 1994 to more than 11,000 organizations and more than 40 million end users worldwide, has been actively evolving the product from an MVS-only mainframe database to a universal data base, according to Hershel Harris, Director of Database Technology with IBM's Software Solutions Division.

    Harris briefly recounts some watershed accomplishments in the development of DB2. "In 1994, we released an AIX and OS/2 version of the product. In 1995, we provided a parallel edition for data warehousing and a UNIX edition for Sun Microsystems and Hewlett-Packard. In 1997, we released the Universal Database (UDB) edition, adding object extensions, support for OLAP and OLTP applications and additional support for parallel databases that enabled data to be split across multiple nodes in a clustered environment. This year, we announced OS/390 DB2 UDB. Version 6, which should be available in 1999, extends the capability of UDB to understand objects. The family of products now runs across multiple operating environments, including NT, UNIX, OS/390, AIX and other flavors of UNIX. We are no longer a only mainframe product, but we are proud of our mainframe heritage."

    Built around the relational database model, says Hershel, DB2 delivers "built-in security based on privileges." He explains that, for every user with a valid ID or group membership, DB2 DBAs can use the product's native security features to control what the user can do with the database objects.

    "This goes beyond access. For every object and every user, specific privileges can be set up, including read, write, delete, update and run. The objects can be tables, views or procedures, and the privileges can be defined at a very granular level."

    Hershel says that generic SQL data control language statements such as GRANT and REVOKE may be used readily to control object access. He adds that IBM will make available in Version 6 of the OS/390 DB2 UDB product a suite of Administrative Tools similar to those that already ship with distributed platform versions of the product, "We have in Version 5.2 [of our distributed systems product], an easy-to-use, NT-based Administration Tool that allows both graphical and Web-based administration of all distributed DB2 servers. This tool set is being added to [our OS/390 DB2 product] with its release in 1999."

    Hershel is aware of the availability and use of third party products in conjunction with the IBM database, which he describes as "complimentary to the product."

    "IBM encourages complimentary product development by other companies. In the area of DB2 security administration, there are probably a number of companies that deliver products to enhance the capabilities delivered with DB2. These tools may provide a graphical user interface to security administration using IBM's application programming interface. Some products emphasize enhanced query capabilities or enhanced reporting. Some try to integrate system level security with DB2. One company showed me a demonstration recently of an application that enabled speech recognition technology and its use with DB2 database security administration. In general, we are very supportive of these efforts."

    Opportunities to enhance DB2 in a complimentary manner have been exploited by numerous companies, including Platinum Technology, according to Pete Peterson, Vice President for Database Administration Products at Platinum.

    Peterson says that RC/Secure answers a need within companies to simplify the model for managing authority, "With DB2 version 5, IBM allows RACF or external security products to be used in administering security within DB2. It is not a very straightforward procedure and it is difficult to create application and user domains using IBM utilities. Companies can gain a lot of [security administration efficiency] if they had a simple way to pass a hierarchy of privileges from one user to another without having to redo everything."

    RC/Secure, according to Peterson, is designed as a "management layer on top of DB2 - but not a run-time layer." He explains that changes made to security privileges may be applied on an ad hoc basis or in batch mode and suggests that the latter method continues to be preferred by security administrators. He adds that Platinum's RC/Query product also enhances DB2's query facilities and may be employed in connection with RC/Secure to verify updated objects within user and application domains.

    Peterson anticipates a continuing demand for DB2 enhancement products despite IBM's claim that Version 6 will eliminate the need for certain types of enhancement products. Says Peterson, while IBM is trying to move toward a goal of a Universal Database to enable administration across platforms, "there are differences in the mainframe DB2 product that were put there to cater to the MVS folks and to capitalize on the characteristics of that platform that will continue to impede this goal."

    Computer Associates: Enhancement Equals Replacement

    Mark Combs agrees that IBM opened doors to third parties with version 5 of its DB2 implementation on MVS. Combs, who is Senior Vice President for Research and Development with Computer Associates (CA) in Islandia, NY, sees the opportunity created less in terms of enhancing DB2 than as an opportunity to replace RACF with either ACF2 or Top Secret - both CA mainframe security management products.

    "Companies need to move to real, rules-based security - that is, a situation in which business rules determine access. Today, in many mainframe environments, about 75 percent of the rules are controlled by system management products such as CA-ACF2, CA-Top Secret or RACF from IBM. Another 25 percent are actually established or enforced using much less robust SQL database security capabilities in products like DB2. What is needed is an integrated management infrastructure that enable centralized, rules-based security across the entire environment and that provide administrative tools on the mainframe, as well as graphical user interface-based tools on the desktop," says Combs.


    How to get DB2 admin certified | killexams.com real questions and Pass4sure dumps

    I'm interested in doing certification in DB2 administration for OS/390. I would like to master the subject, not just get the certification.

    Well, the best way to master any subject is by doing it. So, with that in mind, you should secure a position where you have access to DB2 and need to work with it to perform your job. But, I'm guessing that your objective is to get a job and that you are looking to get certified to obtain one. If that is the case, then there are some steps you can take. First of all, consider obtaining the following books for study and reference: DB2 Developer's Guide, 5th edition by Craig S. Mullins Db2 For The Z/os Version 8 Certification by Susan Lawson DB2 Universal Database for OS/390 v7.1 Application Certification Guide by Susan Lawson You should also download, and review, all of the DB2 for z/OS manuals from the IBM Web site. Additionally, regularly review the in-depth technical articles published by IBM at its developerWorks site. Other good Web sites to bookmark and review include Search390.com, SearchDatabase.com, dbazine.com, DB2 for OS390, and DB2 Times. Regarding your final question, I would say that the best way to obtain my DBA book is via amazon.com.

    Editor's note: Do you agree with this expert's response? If you have more to share, post it in one of our .VO7aaqqaAFk.0@/search390>discussion forums.


    Basic SQL Coding for DB2 Universal Database for OS/390 | killexams.com real questions and Pass4sure dumps

    Take a look at the four primary statements of DML: Select, Update, Insert, and Delete. You will learn the function each of these can play in your efforts to master DB2. You will also look at various aspects of SQL, a necessary language to understand though the comprehension level will vary depending on the user's activity.

    This chapter is from the book 

    In the previous chapter, we discussed the definitions of various database objects using the Data Definition Language (DDL). In this chapter, we start manipulating the database objects using the portion of SQL known as Data Manipulation Language (DML). We will be populating (inserting) data into the database and retrieving the data using many powerful methods. Depending on the sophistication of the database users, they can use SQL to query the database. The majority of the SQL statements within a DB2 application involve DML statements. Therefore, application developers must understand the various methods of inserting, updating, and retrieving data from the database. We will start with simple retrieval statements and gradually introduce more complex methods of data manipulation. The DB2 Certification database will be used for most of the examples. There are four main DML SQL statements we consider: SELECT, INSERT, UPDATE, and DELETE.

    SQL is based on mathematical principles, specifically on set theory and relational algebra. The data is stored in the database as unordered sets of data records. SQL is a set-oriented language, and many of its language elements are directly related to relational algebraic terms, such as permutation, projection, restriction, and join.

    A set of data is represented in a DB2 database as a table or a view and is stored in a DB2 table without regard to order. To retrieve data in a particular order, an ORDER BY phrase must be added to a SELECT statement. Similarly, if the data is to be grouped, then a GROUP BY phrase must be added to the statement.

    Now, let's review the DB2CERT database design defined in the previous chapter and manipulate data using various SQL statements. There are three main tables: CANDIDATE, TEST, and TEST_CENTER. Each table represents a set of records that correspond to a test candidate (person), a test, and a test center (location).

    There is an associative table, known as the TEST_TAKEN table, that is used to reflect the relationships among the three main tables. The TEST_TAKEN table is used to schedule the test candidates and also to maintain their test scores.

    NOTE

    The longest SQL statement is 32,765 bytes.

    Remember that to execute any operation, the user must have the necessary privileges.

    Retrieving the Entire Table

    The most basic of all retrieval command involves the SELECT statement with no operators other than the name of the table. This SQL statement retrieves all of the candidates who have taken a DB2 Certification exam. The information requested is contained in the table TEST_TAKEN.

    SELECT * FROM db2cert.test_taken

    SQL is a data access language that consists of language statements and clauses. There are many optional clauses that can be used to modify the output. The output of a SELECT statement is known as a result set or result table. The results from the SELECT statement are shown next. In this example, using an asterisk or star character (*) for column selection, the columns will be returned to the user in the order in which they are defined in the table.

    CID TCID NUMBER DATE_TAKEN START_TIME FINISH_TIME SCORE PASS_FAIL SEAT_NO --- ---- ------ ---------- ---------- ----------- ----- --------- ------- 111 TX01 500 01/01/2000 11:30:00 12:30:00 65 Y 1 111 TX01 501 02/02/2000 10:30:00 11:45:00 73 Y 1 111 TX01 502 03/03/2000 12:30:00 13:30:00 67 Y 1 222 TR01 500 01/01/2000 14:00:00 15:30:00 55 N 2 222 TR01 502 01/02/2000 09:00:00 10:15:00 53 N 2 222 TR01 502 02/18/2000 10:00:00 11:30:00 75 Y 2 333 TX01 500 03/01/2000 11:30:00 13:00:00 82 Y 2 333 TX01 501 12/29/2000 14:00:00 - - - 1 333 TX01 502 03/02/2000 14:00:00 14:30:00 92 Y 1 9 record(s) selected.

    In SQL, the * is used to indicate that all columns of a table are being referenced. In this example, the SQL statement refers to all of the columns defined for the DB2CERT.TEST_TAKEN table. If the table is altered and a new column is added to the table definition, the result set would contain the new column.

    NOTE

    Adding a new column to an existing table will result in default values being populated for the existing rows.

    Since the output of the SQL statement using * character varies according to the table definition, it is recommended that you specify all of the column names you want to see in the SELECT statement. We could have obtained the same result as the statement using SELECT * with the following SQL statement.

    SELECT cid, tcid, number,date_taken,start_time, finish_time,score,seat_no FROM db2cert.test_taken;

    NOTE

    The * character is used to refer to all of the columns defined for a table. The order of the columns in the result table is the same order as specified in the CREATE TABLE or CREATE VIEW statement.

    What is returned to the user is known as the result set. If the result set is large it is advisable to be sure to filter the data using a WHERE predicate.

    The FROM clause is required for the DML SQL statement, since it describes the location (table or view) of the data. Our example references a single table called DB2CERT.TEST_TAKEN. The SELECT and FROM clauses are required in all data retrieval statements. The list of columns following the SELECT keyword is referred to as the select list.

    Projecting Columns from a Table

    Projection is a relational operation that allows you to retrieve a subset of the defined columns from a table. The next example restricts the output from the SELECT command so that only the candidate ID, test center, and test number attributes from the TEST_TAKEN table are shown.

    SELECT cid,tcid,number FROM db2cert.test_taken

    The output of this SELECT statement is shown below.

    CID TCID NUMBER --- ---- ------ 111 TX01 500 111 TX01 501 111 TX01 502 222 TR01 500 222 TR01 502 222 TR01 502 333 TX01 500 333 TX01 501 333 TX01 502 9 record(s) selected.

    The order of the columns in the result table will always match the order in the select list. The order of the columns as they were defined in the CREATE TABLE or CREATE VIEW statement is ignored when a select list is provided in the SQL statement. In this example, the order of the columns is similar to the order in the CREATE TABLE statement, since the CID column was defined prior to TCID and NUMBER columns.

    Changing the Order of the Columns

    Permutation is the relational operation that allows you to change the order of the columns in your result table. Permutation is used every time you select columns in an order different than the order defined in the CREATE TABLE statement. For example, to display the test center ID prior to the candidate IDs and the test number, you could execute the following:

    SELECT tcid,cid,number FROM db2cert.test_taken

    The result of this SELECT statement specifies a select list in a different order than was defined in the table definition.

    TCID CID NUMBER ---- --- ------ TX01 111 500 TX01 111 501 TX01 111 502 TR01 222 500 TR01 222 502 TR01 222 502 TX01 333 500 TX01 333 501 TX01 333 502 9 record(s) selected.

    NOTE

    We refer to the output of a SELECT statement as the result table because the output of all SELECT statements can be considered a relational table.

    Restricting Rows from a Table

    Restriction is a relational operation that will filter the resulting rows of a table. Restriction can be accomplished through the use of predicates defined in a SQL WHERE clause. To restrict the result set, we need to add a WHERE clause to the SQL statement.

    NOTE

    A predicate is a condition placed on the data. The result of the condition is TRUE, FALSE, or UNKNOWN.

    The WHERE clause specifies conditions or predicates that must be evaluated by DB2 before the result table is returned to the end user. There are many valid types of predicates that can be used. In the following example, the equality (=) predicate is used to restrict the records to only those candidates who have taken a DB2 Certification test at the test center TR01.

    SELECT tcid,cid FROM db2cert.test_taken WHERE tcid ='TR01'

    The WHERE clause also accepts other comparison operators, such as greater than (>), less than (<), greater than or equal to (>=), less than or equal to (<=), and not equal to (<>).This statement is an example of a basic predicate. A basic predicate compares two values. In addition, more complex predicates, such as LIKE, BETWEEN, and IN, are also valid and will be discussed later.

    NOTE

    Trying to execute this example SQL statement will result in a data type compatibility error, because the column TCID is defined with a user-defined data type (UDT).

    Predicate Evaluation for UDTs

    The column TCID was defined as a user-defined data type. To make the comparison in the WHERE clause valid, a casting function needs to be used. This is not mandatory if the comparison is to a literal or host variable. This technique is however demonstrated below:

    SELECT tcid, cid FROM db2cert.test_taken WHERE tcid=CAST('TR01' AS db2cert.center_id)

    Predicate evaluation requires that the data types be compatible (same data type or a compatible data type). We can accomplish the data type conversion (cast) using one of two methods:

  • Use the CAST expression.
  • Use a casting function.
  • Refer to Chapter 15, "Object Relational Programming," for more information on casting for UDTs.

    NOTE

    Although not always mandatory, casting is recommended to ensure compatible data types are compared, including length and scale. This allows DB2 to resolve these as indexable rather than stage 2 predicates.

    Restricting Rows Using Multiple Conditions

    It is possible to combine multiple conditions (predicates) in a single SQL statement. The predicates can be combined using Boolean operators, such as the AND or OR operators. These operators allow you to combine multiple conditions in a single SQL statement. The order of the predicate evaluation will not affect the result set (known as set closure).

    The next example retrieves the records for the test candidates who took a test at test center TR01 and achieved a score greater than 65. The rows that satisfy the predicates are known as the qualifying rows. The following example is an SQL statement using multiple predicates:

    SELECT tcid,cid,score FROM db2cert.test_taken WHERE tcid= CAST('TR01' AS db2cert.center_id) AND score > 65 Selecting Columns from Multiple Tables

    There are basically two operations that combine columns from multiple tables in a single SQL statement. These operations are

    Cartesian Product

    A Cartesian product is a relational operation that will merge all the values from one table with all the values from another table. This operation is not used frequently because the result table can be very large. The number of rows in the result table is always equal to the product of the number of rows in the qualifying rows for each of the tables being accessed.

    NOTE

    The DB2 optimizer may choose to utilize a Cartesian product of unrelated tables if this is deemed to be an efficient method of accessing multiple tables. An example would be two single-row tables that are joined with a large table. The cross-product of 1 ∴ 1 = 1; thus the large table access is deferred as late as possible, with a potential increase in the restrictive predicates that can be applied without incurring the overhead of a large Cartesian result. This method of table access is typical in processing queries against a star schema data model.

    The following example is a Cartesian product of all test numbers and test names from the TEST table, with all candidates from the TEST_TAKEN table. First, select from the TEST table.

    SELECT number, name FROM db2cert.test NUMBER NAME ------ -------------------------------------------------- 500 DB2 Fundamentals 501 DB2 Administration 502 DB2 Application Development 3 record(s) selected. Next select of all candidates from the test_taken table. SELECT cid,tcid FROM db2cert.test_taken CID TCID --- ---- 222 TR01 222 TR01 222 TR01 111 TX01 111 TX01 111 TX01 333 TX01 333 TX01 333 TX01 9 record(s) selected.

    Then combine the two tables to form a Cartesian product result table.

    SELECT db2cert.test_taken.number,cid,tcid FROM db2cert.test_taken,db2cert.test NUMBER CID TCID ------ --- ---- 500 111 TX01 501 111 TX01 502 111 TX01 500 222 TR01 502 222 TR01 502 222 TR01 500 333 TX01 501 333 TX01 502 333 TX01 500 111 TX01 501 111 TX01 502 111 TX01 500 222 TR01 502 222 TR01 502 222 TR01 500 333 TX01 501 333 TX01 502 333 TX01 500 111 TX01 501 111 TX01 502 111 TX01 500 222 TR01 502 222 TR01 502 222 TR01 500 333 TX01 501 333 TX01 502 333 TX01 27 record(s) selected.

    There are two tables referenced in the FROM clause of this query. The tables are separated by commas. There is no relationship expression in the WHERE clause. This type of query results in a Cartesian product.

    The result table is a representation of all possible combinations of the input tables. The TEST table has three rows, and the TEST_TAKEN table has nine rows. Therefore, the SELECT statement shown above returns 27 rows. Note the first column name in this query. It is necessary to fully qualify the column name by providing the schema name and table name with the column name because this column exists in both the TEST table and TEST_TAKEN table. In this case, we needed to specify that the NUMBER column is to be retrieved from the DB2CERT.TEST_TAKEN table and not from the DB2CERT.TEST table.

    By adding a predicate to a Cartesian product SQL query, the result table can represent a more useful representation of the data. In the example below, the query represents all of the tests that were taken by the candidate whose ID is 111.

    SELECT db2cert.test_taken.number,cid,tcid FROM db2cert.test_taken,db2cert.test WHERE cid='111' NUMBER CID TCID ------ --- ---- 500 111 TX01 500 111 TX01 500 111 TX01 501 111 TX01 501 111 TX01 501 111 TX01 502 111 TX01 502 111 TX01 502 111 TX01 9 record(s) selected.

    Adding a WHERE clause to your query does not always provide the desired result. In the example shown above, you want to know all of the tests that were taken by the candidate whose ID is 111, and the query returns nine rows. But we know from previous queries that the candidate took only three tests. The query in the example above has a WHERE clause to filter out the candidate whose ID is 111 from the TEST_TAKEN table, but there was no filter on the TEST_CENTER table. Therefore, the result of the query would always be a multiple of the number of testing centers. Usually, when multiple tables are referenced, you should include a cross-table relationship using a table merge or join method, as shown in the following example. We will examine table join methods further in the next section.

    SELECT db2cert.test_taken.number,cid,tcid FROM db2cert.test_taken,db2cert.test WHERE cid= '111' AND db2cert.test_taken.number=db2cert.test.number NUMBER CID TCID ------ --- ---- 500 111 TX01 501 111 TX01 502 111 TX01 3 record(s) selected.

    To avoid data redundancy, it is recommended that the database tables be normalized. Following a normalization process, a number of related tables will exist. To satisfy some of the required queries, the tables must be reconstructed. The tables are reconstructed temporarily, using a table join strategy to produce a single-result table.

    The result tables in the previous examples usually provided candidate ID numbers and not the complete name of the test candidates. The candidate IDs are stored in the TEST_TAKEN table, and the full names are stored in the CANDIDATE table. To obtain the name of a candidate, the data must be retrieved from the CANDIDATE table, using a relationship or join strategy.

    Consider an example that will list the names and phone numbers of candidates who were registered to take a DB2 Certification test in 2000. To accomplish this, we need to select data from two different tables:

  • db2cert.candidate
  • db2cert.test_taken
  • Let's retrieve a list of candidate names, phone numbers, and IDs from the CANDIDATE table. The candidate names were stored in multiple columns to allow for easy retrieval by last name.

    SELECT fname,initial,lname,hphone,cid FROM db2cert.candidate

    The output of this example follows. Pay special attention to the values in the CID column. It will be used as the join column in the next example.

    FNAME INITIAL LNAME HPHONE CID -------- ------- ---------- ---------- --- Bill B Wong 1115551234 111 George Baklarz 2226543455 222 Susan M Visser 4442314244 333 Glen R Sheffield 5552143244 444 Jim G Stittle 6662341234 555 Kevin W Street 7773142134 666 Bert F Nicol 8886534534 777 Paul C Zikopoulos 9992112212 888 8 record(s) selected.

    Now, let's retrieve the ID numbers of those candidates who were registered to take the test in 2000.

    SELECT distinct cid FROM db2cert.test_taken WHERE YEAR(date_taken) = 2000 CID --- 222 111 333 3 record(s) selected.

    The candidate IDs in the TEST_TAKEN table must correspond to a candidate ID in the CANDIDATE table because of the declarative referential integrity constraints. The parent table in the relationship is the CANDIDATE table and the child table (dependent table) is the TEST_TAKEN table.

    The result table from the above query does not include the test candidate 444, since that candidate did not have a test scheduled for 2000. We need to join the two result tables based on the candidate ID values. This column is known as the join column.

    NOTE

    Query performance can significantly improve if the join columns are appropriately indexed.

    The following single query will satisfy the end-user requirement.

    SELECT distinct fname,initial,lname,hphone FROM db2cert.test_taken,db2cert.candidate WHERE YEAR(date_taken) = 2000 AND db2cert.test_taken.cid=db2cert.candidate.cid

    A table join requires a predicate that includes an expression based on columns from the tables referenced in the FROM clause. This is known as a join predicate. The FROM clause has not changed from the Cartesian product examples. The only difference is in the join predicate (test_taken.cid = candidate.cid).

    NOTE

    An alternative form of the FROM clause for joins involves explicitly coding the JOIN keyword between the tables (rather than using a comma) and coding the join predicates in the ON clause rather than in the WHERE clause. This method of coding will be covered in more detail in Chapter 4, "Advanced SQL Coding."

    The table names needed to be explicitly stated because there is a column named CID in both of the referenced tables. When multiple tables are being accessed in a single query, any selected columns that occur in more than one table must be qualified with the table name.

    NOTE

    An error will occur if the columns being referenced are ambiguous (not properly qualified).

    The maximum number of base tables that can be in a single SQL statement is 225; however, you are limited to 15 tables in a join (the FROM clause).

    NOTE

    The 15-table limit can be increased by updating the macro SPRMMXT to a value greater than 15.

    This kind of join operation shown in the above example is also known as an inner join. An inner join displays only the rows that are present in both of the joined tables.

    Using Correlation Names

    If each of the columns needed to be fully qualified with the table name, such as tableschema.tablename.columnname, the queries would become very large and cumbersome to work with. Fortunately, there is an easier way to qualify the ambiguous columns resulting from a multitable SELECT statement.

    The columns can be qualified using a correlation name. A correlation name is a temporary alias for the tables referenced in an SQL statement. We rewrite the previous query using correlated names as follows:

    SELECT distinct fname,initial,lname,hphone FROM db2cert.test_taken tt, db2cert.candidate c WHERE YEAR(date_taken) = 2000 AND tt.cid = c.cid

    The correlation name immediately follows the name of the table as stated in the FROM clause. In this example, the correlated name for the TEST_TAKEN table is tt, and the correlated name for the CANDIDATE table is c.

    NOTE

    Correlation names can be optionally prefixed with the AS keyword, such as DB2CERT.CANDITATE AS C. This is purely for readability.

    The correlated names are accessible within the SQL statement only. Following the execution of the SQL statement, the correlation name is no longer defined. Once a correlation name has been defined, it can be referenced in the rest of the query instead of the table name. However, the table name can still be referenced.

    NOTE

    Use simple, easy-to-remember correlation names. Table initials are good candidates for correlation names.

    Sorting Your Output

    We have been retrieving data from one or more tables. The order of the result table has not been specified in any of the SQL statements. Therefore, the data is retrieved in an undetermined order if there is no ORDER BY clause in the SQL statement.

    NOTE

    The only guaranteed way to return data in the required sequence is with the ORDER BY clause. Any data retrieval that is currently returned in sequence without this clause is purely based upon the data retrieval method at the time. A future access path change may not return the data in the same sequence.

    The following example produces a list of the test candidates in alphabetical order by last name for the candidates who have taken a DB2 Certification test at the TR01 test center.

    SELECT lname,initial,fname FROM db2cert.candidate c,db2cert.test_taken tt WHERE c.cid=tt.cid AND tcid='TR01' ORDER BY lname

    This example contains a new clause, ORDER BY. After the ORDER BY clause, you can list the columns that will specify the sort order and the type of sort.

    NOTE

    Appropriate indexing may allow DB2 to avoid sorting the data to match the ORDER BY clause. If the data is already sequenced via the index, DB2 may choose to utilize the index and avoid sorting the data. DB2 cannot avoid a sort for an ORDER BY involving columns from more than one table. Where possible, include columns from only one table in the ORDER BY to give DB2 greater opportunity for sort avoidance.

    The SQL can be modified so that the output is changed to descending order by last name and a secondary order column on the first name in ascending order.

    SELECT lname,fname,hphone FROM db2cert.candidate c,db2cert.test_taken tt WHERE c.cid=tt.cid AND tcid= 'TR01' ORDER BY lname DESC, fname

    In this example, the DESC keyword that follows the lname column indicates that the result table should be in descending order based on the last name. More than one record can have the same last name. This situation is quite common. There is a second column specified in the ORDER BY clause, fname. There is no keyword specifying the sort sequence based on the fname column. Therefore, the default ordering sequence (ascending) is used.

    The next example contains three columns lname, fname, and hphone. You can reference the column that should be used to sort the data using the column name or by specifying its position in the select list. Using the column position is useful when the column in the select list is made up of derived columns (calculated columns) that have no explicit name.

    SELECT lname,fname,hphone FROM db2cert.candidate c,db2cert.test_taken tt WHERE c.cid=tt.cid AND tcid='TR01' ORDER BY 1 DESC, 2

    In this example, the sort order is specified using the column position. Therefore, the query result is exactly the same as the in previous example.

    You can also assign an alternative column name using column renaming. The assigned name can then be referenced in the ORDER BY clause, and it appears as the column heading where appropriate.

    NOTE

    Although useful, coding a column position rather than a column (or renamed column) in the ORDER BY clause may lead to a different sequence if another column is inadvertently added to the query that alters the column positioning.

    The ORDER BY clause must succeed all subselects in the FULLSELECT statement. The only clauses that can succeed the ORDER BY clause are the for FOR FETCH ONLY, FOR READ ONLY, OPTIMIZE, WITH QUERYNO, FETCH FIRST n ROWS clauses.

    Derived Columns

    There are some cases when you will need to perform calculations on the data. The SQL language has some basic mathematical and string functions built in. Mathematical operations include standard addition, subtraction, multiplication, and division.

    The calculation can be defined in the WHERE clause of the SQL statement or the select list. Suppose that you need to calculate a passing rate for a DB2 test. The passing rate is defined as the percentage of candidates that pass the test (totalpassed*100/totaltaken). The following SQL statement will accomplish this for us for test number 500:

    SELECT number, totalpassed*100/totaltaken FROM test WHERE number='500'

    In this example, the second column of the output list is a calculated column. Remember that you must use the column position if you want to use this calculated column for the ORDER BY clause unless you name it (as we now discuss).

    NOTE

    Occasionally, the results of a derived column may not display as expected. The example using totalpassed*100/totaltaken will result in a value of 66 being retrieved. Since both the totalpassed and totaltaken columns are integers, the final result is also an integer, and the fractional part is discarded. If this is not your desired result, you should use other functions (like decimal) to change the way the calculation is performed or displayed.

    Naming Derived/Calculated Columns

    You can specify a column name for any expression. When you provide the derived (calculated) column with a name, the ORDER BY clause can reference the derived name to allow for a more readable SQL statement.

    The following SQL calculates the percentage of people that have passed the DB2 Certification exams and orders the output in descending order of the passing rate.

    SELECT number,totalpassed*100/totaltaken AS PassedRate FROM test ORDER BY PassedRate DESC

    The AS clause is used to rename the default name of an element in the select list. In this example, we are giving the name of PassedRate to the result of the division of columns totalpassed by totaltaken. The named column is used in the query to specify the column that should be used for sorting the output.

    NOTE

    The AS keyword is optional, although it should be added for readability. Without the AS clause, it may be unclear whether the intention was to rename a column or a comma was missed between two retrieved columns.

    Functions

    In DB2, there are different types of functions provided. For example, two types of functions provided by DB2 are scalar and column functions (a third type of function called a table function is discussed in Chapter 15, "Object Relational Programming."

  • Scalar functions (also known as row functions) provide a result for each row of the result table. A scalar function can be used any place an expression is allowed.

  • Column functions (also known as vector functions) work with a group of rows to provide a result. The group is specified using a FULLSELECT and optionally grouped using the GROUP BY clause.

  • In this section, we introduce you to some of the SQL functions provided with DB2. SQL functions are categorized by their implementation type. Either the functions are built in or they are extensions of DB2 and are known as user-defined functions (UDFs).

  • Built-in functions are defined within the SQL standards, and they are provided by DB2. These can be either scalar or column functions.

  • UDFs are not defined within the SQL standards because they are extensions of the current SQL language. These functions can be developed by a DB2 administrator or application developer. UDFs can be either scalar or table functions, but not column functions. Once the UDFs have been created, they can be invoked by any end user with the proper privileges. For more information about UDFs, refer to Chapter 15.

  • Scalar Functions

    Scalar functions are applied to each row of data, and there is a per-row result provided. If we want to retrieve only the first three digits of telephone numbers for each candidate, we could use a scalar function. The function that is used is called SUBSTR. The arguments for this function include a string data type column, a beginning offset, and length. The output data type and attribute of the function depend on the input data type and attribute. The following example retrieves the telephone area code for the column wphone.

    SELECT lname, SUBSTR(CHAR(wphone),1,3) FROM db2cert.candidate

    The SUBSTR function is a scalar function. In this example, SUBSTR returns a character string of three characters. The result string corresponds to the first three characters of the wphone column. This function is known as a string function because it works with any string data type. If we wanted to provide the output column with a meaningful name, we could provide an alias, as was done for calculated columns.

    In the example above, the substring starts from the beginning of the string, because we indicate one (1) as the second parameter of the function. The length of the resulting string is indicated in the third argument. In our example, the length is three. Note that the data type of the wphone column is phone, so a casting function is used to convert the phone data type to the char data type.

    The following query will provide the month when the exam was taken. The input for this function is a DATE string, and the output is an integer.

    SELECT fname, MONTH (date_taken) FROM candidate c, test_taken tt WHERE c.cid=tt.cid Column Functions

    Column functions provide a single result for a group of qualifying rows for a specified table or view. Many common queries can be satisfied using column functions where they include common tasks, such as finding the smallest value, the largest value, or the average value for a group of data records. In the following example you can obtain the maximum length of time of any of the DB2 Certification exams:

    SELECT MAX("length") FROM test

    Because the length column shares its name with the length scalar function, the column name is encased within double-quotes to distinguish this as a column and not a function.

    If we added a WHERE clause to this example, the maximum would represent the maximum length for the qualifying rows, since the predicate is used to filter the data prior to the application of the MAX function.

    This next example calculates the average of the number of seats for all of the test centers. Notice the column function AVG is used in this example:

    SELECT AVG(noseats) FROM test_center

    DB2 provides many more built-in functions. If you are interested in calculating statistical information, you can use statistical functions, such as VARIANCE, STDDEV, or a sampling of these functions.

    NOTE

    MAX and MIN functions can be either column or scalar functions depending on the input arguments.

    Grouping Values

    Many queries require some level of aggregated data. This is accomplished in SQL through the use of the GROUP BY clause. The following SQL obtains the average number of seats for each country:

    SELECT country, AVG(noseats) FROM test_center GROUP BY country

    This SQL statement obtains the average number of seats per country, and the GROUP BY clause tells DB2 to group together the rows that have the same values in the columns indicated in the GROUP BY list. In our example, we are grouping countries into subsets. As the subsets are created, DB2 calculates the average of each of those groups or subsets, in this case, by each country.

    When you combine column functions and other elements, such as column names, scalar functions, or calculated columns, you must use the GROUP BY clause. In this case, you must include every element that is not a column function in the GROUP BY list. The only elements that can be omitted in the GROUP BY list are constant values.

    The next SQL statement obtains a list that includes the average cut score and minimum test length for the DB2 Certification exams. We group this list by the type of exam, as follows:

    SELECT type, AVG(cut_score), MIN("length") FROM test GROUP BY type

    NOTE

    Appropriate indexing can allow DB2 to avoid a sort to group the data rows to match the GROUP BY clause.

    It is possible to sort the output of the previous example using an ORDER BY clause.

    NOTE

    GROUP BY may return data in the same order as an ORDER BY, but this is not guaranteed and is based upon the access path. The only method to guarantee data sequence is with an ORDER BY.

    Restricting the Use of Sets of Data

    Up to now, we have discussed how to restrict output based on row conditions. With SQL, it is also possible to restrict that output using column functions and the GROUP BY clause. Suppose you want a list of all the test centers that have administered more than five DB2 Certification exams. To make it easier to understand, let's first get the number of tests that have been taken in each test center.

    SELECT tcid, count(*) FROM test_taken GROUP BY tcid

    We use the COUNT column function to get the total number of tests that have been taken in each test center. When you use an asterisk (*) with the COUNT function, you are indicating that you want the number of rows in a table that meet the criteria established in the SQL statement. In this example, we are grouping by TCID because we have a number of occurrences for all the test centers in the TEST_TAKEN table. The TEST_TAKEN table has an entry for every DB2 Certification exam that has been taken. Finally, the output is restricted to only those test centers that have administered more than four exams.

    SELECT tcid FROM test_taken GROUP BY tcid HAVING COUNT(*) > 4

    This example introduces the HAVING clause. The HAVING clause is equivalent to the WHERE clause for groups and column functions. The HAVING clause will restrict the result set to only the groups that meet the condition specified in it. In our example, only the test centers that have administered more than four DB2 Certification exams will be displayed.

    Eliminating Duplicates

    When you execute a query, you might get duplicate rows in the answer set. The SQL language provides a special clause to remove the duplicate rows from your output. The following SQL generates a list of names and phone numbers for all the candidates who have taken a test. In the following example, we eliminate the duplicate rows from our output list using the DISTINCT clause.

    SELECT DISTINCT fname,wphone,hphone FROM candidate c,test_taken tt WHERE c.cid=tt.cid

    The DISTINCT clause can also be used with the COUNT function. When you use DISTINCT inside a COUNT function, it will not count the duplicate entries for a particular column. The following example allows you to count how many different test centers have candidates registered.

    SELECT COUNT(DISTINCT tcid) FROM test_taken

    This example provides the number of test centers that are registered in the TEST_TAKEN table. Remember that all the candidates who have registered for DB2 Certification exams are stored in this table. Make sure that you understand the difference between COUNT(*), COUNT(colname), and COUNT(DISTINCT colname). They are very similar in syntax but differ in function.

    NOTE

    COUNT(*) returns a count of all rows that qualify against the WHERE clause. COUNT(colname) returns a count of all rows that qualify against the WHERE clause, with null occurrences of colname removed. COUNT(DISTINCT colname) counts distinct occurrences of colname, with nulls removed.

    Searching for String Patterns

    SQL has a powerful predicate that allows you to search for patterns in character string columns. This is the LIKE predicate. Suppose you want to generate a list of the candidates whose first name starts with the letter G.

    SELECT fname,lname,wphone,hphone FROM candidate WHERE fname LIKE 'G%' ORDER BY lname,fname

    In this query, we use a wildcard character with the LIKE predicate. In SQL, the percent character (%) is a substitute for zero or more characters. The search string G% can be substituted with names like George, Gary, Ginger, and so on (since the percent character can substitute zero or more characters, the search string can also be a single letter G).

    The percent character can be used any place in the search string. It also can be used as many times as you need it. The percent sign is not case-sensitive, so it can take the place of uppercase or lowercase letters. However, the constant characters included in your search string are case-sensitive.

    Another wildcard character used with the LIKE predicate is the underline character (_). This character substitutes one and only one character. The underline character can take the place of any character. However, the underline character cannot be substituted for an empty character.

    NOTE

    If the pattern needs to search for occurrences of the wildcard characters % and _ as their actual values, then the ESCAPE clause is used to specify a character that precedes the percent or underscore in the pattern.

    The previous SQL can be modified to include all candidates' names and the telephone numbers for those candidates whose name has a lowercase letter "a" as its second letter.

    SELECT fname,lname,wphone,hphone FROM candidate WHERE fname LIKE '_a%' ORDER BY lname,fname

    This example uses two wildcard characters that work with the LIKE predicate. The search string in this example can include names, such as Paul, Gabriel, or Natalie. (The first character may be any character, the lowercase letter "a" is the second character in the string, and the string ends with any number of characters.)

    NOTE

    When the pattern in a LIKE predicate is a fixed-length host variable, the correct length must be specified for the string to be returned. 'G%' assigned to an 8-byte variable (LIKE :variable) will search for all occurrences of 'G% ' (G, followed by any character, followed by 6 blank characters). To find rows that begin with a G, then 'G%%%%%%%' should be assigned to the fixed-length variable.

    Searching for Data in Ranges

    SQL also offers us a range operator. This operator is used to restrict rows that are in a particular range of values. Consider the requirement to list those candidates whose scores in the DB2 Certification exam are between 60 and 75.

    SELECT DISTINCT fname,lname,wphone,hphone FROM candidate c, test_taken tt WHERE c.cid=tt.cid AND score BETWEEN 60 AND 75

    The BETWEEN predicate includes the values that you specify for searching your data. An important fact about the BETWEEN predicate is that it can work with character ranges as well.

    In addition to the score requirement, this example modifies the SQL to include only those candidates whose last name begins with a letter between B and G.

    SELECT DISTINCT fname,lname,wphone,hphone FROM candidate c, test_taken tt WHERE c.cid=tt.cid AND score BETWEEN 60 AND 75 AND lname BETWEEN 'B' AND 'GZ'

    In this example, the second BETWEEN predicate contains character values. We need to specify the GZ value to include all the possible names that start with the letter G. This was done assuming that the letter Z is the last possible value in the alphabet.

    NOTE

    The arguments of the BETWEEN clause are not interchangeable; the first must specify the low value, and the second, the high value. BETWEEN 1 AND 2 will return all values within the range (inclusive of 1 and 2). BETWEEN 2 AND 1 will return zero rows.

    Searching for Null Values

    Null values represent an unknown value for a particular occurrence of an entity. We can use a null value in the cases where we don't know a particular value of a column. Let's say that we want a list of all those candidates whose score is not yet input. This condition is represented with a null value.

    SELECT fname,lname,wphone,hphone FROM candidate c, test_taken tt WHERE c.cid=tt.cid AND score IS NULL

    The IS predicate is used to search for the null value in this example. Remember that the null value means "unknown." Because it has no particular value, it can't be compared with other values. You can't use conditional operands, such as equal (=) or greater than (>), with null values.

    Searching for Negative Conditions

    The BETWEEN, IS, and LIKE predicates always look for the values that meet a particular condition. These predicates can also be used to look for values that don't meet a particular criterion.

    The NOT predicate can be used to look for the opposite condition, combined with the LIKE, BETWEEN, and IS predicate, to accomplish negative searches, as shown in the following example. This example has a LIKE predicate combined with the NOT predicate. We want a list of those candidates whose last names do not start with the letter S.

    SELECT DISTINCT fname,lname,wphone,hphone FROM candidate WHERE lname NOT LIKE 'S%' ORDER BY lname,fname

    The next example has a BETWEEN predicate combined with the NOT predicate. We want the list of those candidates whose score, in any test, is not in the range 60 to 75.

    SELECT DISTINCT fname,lname,wphone,hphone FROM candidate c, test_taken tt WHERE c.cid=tt.cid AND integer(score) NOT BETWEEN 60 and 75

    In this example, the NOT predicate will exclude all the values that are in the range 60 to 75.

    Negation can also be applied to the null value. This SQL produces a report that searches for those candidates that have a seat number assigned. This is expressed with a NOT NULL value.

    SELECT DISTINCT fname,lname,wphone,hphone FROM candidate c, test_taken tt WHERE c.cid=tt.cid AND seat_no IS NOT NULL

    NOTE

    The NOT operator can also be used to negate the standard comparison operators, =, <, <=, >, and >=.

    When dealing with nulls, NOT or negation may not return the opposite of the positive logic. For example, WHERE SEAT_NO = 1 will return only the rows for seat number 1. Any value other than 1 is discarded, as these rows are FALSE, including nulls, since these are unknown. WHERE SEAT_NO <> 1 excludes rows where the seat number is 1, and also discards nulls because these are unknown.

    Searching for a Set of Values

    In SQL, it is possible to establish a restriction condition based on a set of values. Suppose that you need a list of the test centers that have candidates registered for the DB2 Fundamentals test and for the DB2 Application Development test. This can be queried with the following statement:

    SELECT DISTINCT name,phone FROM test_center tc, test_taken tt WHERE tc.tcid=tt.tcid AND (number = '500' or number ='502')

    To simplify building multiple OR conditions when multiple values for the same column are being compared, it is possible to rewrite the statement using the IN clause.

    SELECT DISTINCT name,phone FROM test_center tc, test_taken tt WHERE tc.tcid=tt.tcid AND number IN ('500','502')

    The IN clause is used to denote a set of values. In this example, we use a constant set of values.

    You can also use the NOT predicate with the IN clause. In this case, the condition will be true when a value is not present in the set of values provided to the IN clause. You can use as many values as you wish in the IN clause, within the defined limits of the size of a SQL statement.

    Advanced Selection Functionality

    In Chapter 4, "Advanced SQL Coding," we will look at more of the functionality and power of the SELECT statement. We will cover topics such as

  • Subqueries
  • Inner and outer joins
  • Nested table expressions
  • CASE expressions
  • Row expressions
  • Unions


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