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IF expressions

Sets a search condition to return a specific subset of data.

IF search-condition
THEN expression1
[ ELSE expression2 ]
ENDIF

This expression returns the following:

• If search-condition is TRUE, the IF expression returns expression1.

• If search-condition is FALSE and an ELSE clause is specified, the IF expression returns expression2.

• If search-condition is FALSE, and there is no expression2, the IF expression returns NULL.

• If search-condition is UNKNOWN, the IF expression returns NULL.

• NULL value
• Search conditions