Getting PL/SQL:ORA-00933 when using CASE logic as a control structure

Question

Hello Everybody,I have created a PL/SQL block(Control Structure) to calculate bonus of employees based on salary of the employee,but I get errors like ORA-00933 and ORA-06550.Given below is the PL/SQL block which I tried to implement
SQL> DECLARE
2
3 v_EMPNO NUMBER(7,2):= &p_EMPNO;
4 v_SAL EMP.SAL%TYPE;
5 v_BONUS NUMBER;
6
7 BEGIN
8 SELECT SAL
9 FROM EMP
10 INTO v_SAL
11 WHERE EMPNO = v_EMPNO;
12
13 v_BONUS :=
14 CASE v_SAL
15 WHEN v_SAL = 0 THEN 0
16 WHEN v_SAL < 1500 THEN (0.1*v_SAL)
17 WHEN v_SAL BETWEEN 1500 AND 3000 THEN (0.15*v_SAL)
18 WHEN v_SAL > 3000 THEN (0.20*v_SAL)
19 END;
20
21 DBMS_OUTPUT.PUT_LINE(' EMPNO '||v_EMPNO||' SALARY '||v_SAL||' BONUS '||V_BONUS);
22
23 END;
24 /
Enter value for p_empno: 7100
old 3: v_EMPNO NUMBER(7,2):= &p_EMPNO;
new 3: v_EMPNO NUMBER(7,2):= 7100;
INTO v_SAL
ERROR at line 10:
ORA-06550: line 10, column 7:
PL/SQL: ORA-00933: SQL command not properly ended
ORA-06550: line 8, column 7:
PL/SQL: SQL Statement ignored
Is it that I can not use "CASE" as a control structure in the above block , when I code
"SELECT SAL
FROM EMP
INTO v_SAL
WHERE EMPNO = v_EMPNO;" to get v_SAL and then use it in CASE exp to calculate a value for v_Bonus.
Kindly let me know.

Answer 1

Hi,
The CASE Expression is also available in PL/SQL.
Try this code:
DECLARE
   V_EMPNO   NUMBER (7, 2)  := 7788;
   V_SAL     EMP.SAL%TYPE;
   V_BONUS   NUMBER;
BEGIN
   SELECT SAL
     INTO V_SAL
     FROM EMP
    WHERE EMPNO = V_EMPNO;
   V_BONUS :=
      CASE
         WHEN V_SAL = 0
            THEN 0
         WHEN V_SAL < 1500
            THEN (0.1 * V_SAL)
         WHEN V_SAL BETWEEN 1500 AND 3000
            THEN (0.15 * V_SAL)
         WHEN V_SAL > 3000
            THEN (0.20 * V_SAL)
      END;
   DBMS_OUTPUT.PUT_LINE (   ' EMPNO '
                         || V_EMPNO
                         || ' SALARY '
                         || V_SAL
                         || ' BONUS '
                         || V_BONUS
END;As you are Using,Comparison Expression to find a match, Your Searched CASE Expression should be something like this.
DECLARE
  sal       NUMBER := 2000;
  sal_desc  VARCHAR2(20);
BEGIN
  sal_desc := CASE
                 WHEN sal < 1000 THEN 'Low'
                 WHEN sal BETWEEN 1000 AND 3000 THEN 'Medium'
                 WHEN sal > 3000 THEN 'High'
                 ELSE 'N/A'
              END;
  DBMS_OUTPUT.PUT_LINE(sal_desc);
END;If you are Using CASE as a Value matching then your piece of code should be like this..
DECLARE
  deptno     NUMBER := 20;
  dept_desc  VARCHAR2(20);
BEGIN
  dept_desc := CASE deptno
                 WHEN 10 THEN 'Accounting'
                 WHEN 20 THEN 'Research'
                 WHEN 30 THEN 'Sales'
                 WHEN 40 THEN 'Operations'
                 ELSE 'Unknown'
               END;
  DBMS_OUTPUT.PUT_LINE(dept_desc);
END;Thanks,
Shankar