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Sets a search condition to return a specific subset of data.
IF search-condition THEN expression1 [ ELSE expression2 ] ENDIF
For compatibility reasons, this expression can end in either ENDIF or END IF.
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.
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