INTERVIEW QUESTIONS MAINFRAME DB2 DETAILS

Question: What techniques are used to retrieve data from more than one table in a single SQL statement?

Answer: EXEC SQL

SELECT
A.EMP_ID

,B.WAGE
FROM
Table1 A,
Table2 B
WHERE
A.EMP_ID = 100001

END-EXEC.

EXEC SQL

SELECT
A.EMP_ID

,B.WAGE
FROM
Table1 A,
Table2 B
WHERE
A.EMP_ID = 100001

END-EXEC.

Source: CoolInterview.com

unions,joins,nested subselects are used to get data from more than one table in single select statement. Source: CoolInterview.com

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