DB2 10 - Introduction - Subqueries - IBM.
Ways to join data from more than one table When you want to see information from multiple tables, you can use a SELECT statement. SELECT statements can retrieve and join column values from two or more tables into a single row.The DB2 optimizer can select the optimal query access plan if you have accurate catalog statistics and choose the best optimization class for your workload. Using the DB2 explain functionality to review potential query access plans and determine how to tune queries for best performance.You can use a subquery to narrow a search condition that is based on information in an interim table. A subquery is a nested SQL statement, or subselect, that contains a SELECT statement within the WHERE or HAVING clause of another SQL statement.You can also code more complex subqueries, such as correlated subqueries and subqueries with quantified predicates.
In this article I'll cover command line and basic GUI tools that are free from IBM with DB2. With these tools you can quickly start running queries. Many people will run these queries from their workstation, but if you have direct access to your database server with tools like telnet or ssh you can run the same command line tools there. By.Hi I wanted to write sql queries in the jcl to retrieve the data from the table of the database and insert into another database of the table. For that purpose I am not aware of coding these kind of things. Anyone of you please explain about it. Thanks! CRRIndia.
Let us assume we have following tables defined on our database. Get all Department names from the table. Get distinct departments from EMPLOYEE table. the criteria described in that WHERE clause. The OR operator joins two or more conditions, but returns a row if ANY of the conditions listed hold true. The percent sign (%) is used to represent.
