IF-THEN-ELSE
IF boolean-expression THEN
statements
ELSE
statements
END IF;
If the return value of the conditional expression in the IF-THEN-ELSE statement is FALSE, then the statement after ELSE will be executed.
Now we have modified the previous example by replacing the IF-THEN statement with the IF-THEN-ELSE statement. This will display the text message 'Non-commission' when it detects that the employee has no commission.
\set PLSQL_MODE on CREATE OR REPLACE PROCEDURE emp_test_2() IS v_empno emp.empno%TYPE; v_comm emp.comm%TYPE; CURSOR emp_cursor IS SELECT empno, comm FROM emp order by 1; BEGIN OPEN emp_cursor; DBMS_OUTPUT.PUT_LINE('EMPNO COMM'); DBMS_OUTPUT.PUT_LINE('----- -------'); LOOP FETCH emp_cursor INTO v_empno, v_comm; EXIT WHEN emp_cursor%NOTFOUND; -- -- Test whether or not the employee gets a commission -- IF v_comm IS NOT NULL AND v_comm > 0 THEN DBMS_OUTPUT.PUT_LINE(v_empno || ' ' ||TO_CHAR(v_comm,'$99999.99')); ELSE DBMS_OUTPUT.PUT_LINE(v_empno || ' ' || 'Non-commission'); END IF; END LOOP; CLOSE emp_cursor; END; / \set PLSQL_MODE off The following is the output of this program.
postgres=# select emp_test_2(); NOTICE: EMPNO COMM NOTICE: ----- ------- NOTICE: 1001 $ 855.90 NOTICE: 1002 $ 300.00 NOTICE: 1003 Non-commission NOTICE: 1004 Non-commission NOTICE: 1005 Non-commission NOTICE: 1006 Non-commission NOTICE: 1007 $ 452.00 NOTICE: 1008 $ 2500.00 NOTICE: 1009 $ 1500.00 EMP_TEST_2 ------------ (1 row) 
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