Calculate difference based on values from 2 different columns

Question

Hello friends,
I want to basically do something like below which is in T-SQL Format :
SUM(CASE columnA WHEN 'ABC' THEN 1 ELSE 0 END) - SUM(CASE columnB WHEN 'XYZ' THEN 1 ELSE 0 END)
For which I was changing the code to following in Oracle :
SUM(CASE columnA='ABC' THEN 1 ELSE 0 END) - SUM(CASE columnB='XYZ' THEN 1 ELSE 0 END)
But its failing validation with an error message - missing right paranthesis....
Rest of the qry is fine and whenever I add this line it starts failing.
Edited by: Sweta on 11-Sep-2009 09:32

Answer 1

Try this
SUM (CASE
                 WHEN columna = 'ABC'
                    THEN 1
                 ELSE 0
              END)
       - SUM (CASE
                 WHEN columnb = 'XYZ'
                    THEN 1
                 ELSE 0
              END)or
COUNT (CASE
                   WHEN columna = 'ABC'
                      THEN 1
                END)
       - COUNT (CASE
                   WHEN columnb = 'XYZ'
                      THEN 1
                END)Remark : you can use this sythax in oracle
SUM(CASE columnA WHEN 'ABC' THEN 1 ELSE 0 END) - SUM(CASE columnB WHEN 'XYZ' THEN 1 ELSE 0 END)Example
SELECT emp_test.*,CASE ename
          WHEN 'SCOTT'
             THEN 1
       END ind
  FROM emp_test
     EMPNO ENAME      JOB              MGR HIREDATE          SAL       COMM     DEPTNO        IND
      7369 SMITH      CLERK           7902 1980-12-17        800                    20          
      7499 ALLEN      SALESMAN        7698 1981-02-20       1600        300         30          
      7521 WARD       SALESMAN        7698 1981-02-22       1250        500         30          
      7566 JONES      MANAGER         7839 1981-04-02       2975                    20          
      7654 MARTIN     SALESMAN        7698 1981-09-28       1250       1400         30          
      7698 BLAKE      MANAGER         7839 1981-05-01       2850                    30          
      7782 CLARK      MANAGER         7839 1981-06-09       2450                    10          
      7788 SCOTT      ANALYST         7566 1987-04-19       3000                    20          1
      7839 KING       PRESIDENT            1981-11-17       5000          0         10          
      7844 TURNER     SALESMAN        7698 1981-09-08       1500                    30          
      7876 ADAMS      CLERK           7788 1987-05-23       1100                    20          
      7900 JAMES      CLERK           7698 1981-12-03        950                    30          
      7902 FORD       ANALYST         7566 1981-12-03       3000                    20          
      7934 MILLER     CLERK           7782 1982-01-23       1300                    10          
14 rows selected.