What's the error??

Question

Hello All,
Could some one tell me what is the error in this procedure?
CREATE OR REPLACE PROCEDURE STUDENTS_COUNT AS
TOT NUMBER;
BEGIN
TOT:=0;
SELECT COUNT(*) INTO TOT FROM STUDENTS;
CASE
WHEN TOT = 0 THEN RAISE_APPLICATION_ERROR(-20001,'SORRY!NO STUDENTS FOUND');
WHEN TOT >= 1 AND TOT <= 5 THEN RAISE APPLICATION ERROR(-20001,'ONLY FEW STUDENTS');
WHEN TOT >6 THEN RAISE APPLICATION ERROR(-20001,'GOOD NO OF STUDENTS');
END CASE;
END ;
Thanks
Balaji

Answer 1

Hi,
First of all there in nothing much wrong in your procedure, Except the "When" clause should not be end up by line terminator ( i.e. ";" )
So the correct syntax is :-
CASE
WHEN TOT = 0 THEN RAISE_APPLICATION_ERROR(-20001,'SORRY!NO STUDENTS FOUND')
WHEN TOT >= 1 AND TOT <= 5 THEN RAISE APPLICATION ERROR(-20001,'ONLY FEW STUDENTS')
WHEN TOT >6 THEN RAISE APPLICATION ERROR(-20001,'GOOD NO OF STUDENTS')
END CASE;
More over if you are Using Oracle 8i then oracle does not support Case Expressions in PLSQL. Even SQLs with CASE expression can not be used in PLSQL. But Oracle 9i version do support the usage of CASE Expression in PLSQL.
Sp program your business logic which is supported by you current oracle version.
Regards
Ripudaman