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Developer-C 11.1
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CREATE FUNCTION isEqual( a IN NUMBER, b IN NUMBER ) RETURN BOOLEAN DETERMINISTIC IS BEGIN IF a = b THEN RETURN a = b; ELSE RETURN NULL; END IF; END; /
DECLARE value BOOLEAN := isEqual( 1, 2 ); BEGIN IF value THEN DBMS_OUTPUT.PUT_LINE( 'Equal' ); ELSIF NOT value THEN DBMS_OUTPUT.PUT_LINE( 'Not Equal' ); ELSE DBMS_OUTPUT.PUT_LINE( 'Neither Equal nor Not Equal' ); END IF; END; /
1 rows affected dbms_output: Neither Equal nor Not Equal