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This chapter contains a basic introduction to Db2 SQL. It also has numerous examples illustrating how to use this language to answer particular business problems. However, it is not meant to be a definitive guide to the language. Please refer to the relevant IBM manuals for a more detailed description.
The db2tutorial.com website provides a comprehensive Db2 tutorial that includes practical examples and many hands-on activities. Once you complete the entire tutorial, you will be able to: Have a local Db2 database server to work with. Interact with data in the Db2 database using SQL statements.
The following examples illustrate the select-statement query. Example 1: Select all columns and rows from the EMPLOYEE table. SELECT * FROM EMPLOYEE. Example 2: Select the project name (PROJNAME), start date (PRSTDATE), and end date (PRENDATE) from the PROJECT table.
The workstation application uses the SQL CONNECT statement to create a conversation with Db2. Db2 creates a Db2 thread to process SQL requests. The SQL statement CALL tells the Db2 server that the application is going to run a stored procedure.
DB2 tutorials. To view the tutorial, click the title. Set up a DB2 database to store XML data and to perform basic operations with the native XML data store. Analyze, optimize, and tune SQL statements for better performance using Visual Explain.
12 Δεκ 2011 · To update two fields you may use an example like this: UPDATE table1 t1 SET (col1, col2) = ( SELECT col3, col4 FROM table2 t2 WHERE t1.col8=t2.col9 ) The optimizer will see that the sub-queries in the SET and the FROM clause are identical and it should merge them in the internal execution plan.
SQL (Structured Query Language) is the standard language you use to interact with a relational database management system (RDBMS). This book uses the free edition of the IBM DB2 database called Express-C Edition to show how SQL works in DB2.
