Help with a correlated subquery. flawed results..

Question

Hi,
Can anyone tell me what I am doing wrong here? I am trying to get the employees whos have above average salarys for there departments.
SELECT first_name||' '||last_name  NAME,
       department_id,
       salary
FROM employee
WHERE salary > (SELECT AVG (salary)
                FROM employee
                GROUP BY department_id);I run this and get this:
ORA-01427: single-row subquery returns more than one rowHow can I amend this subquery to work for my needs? if i leave off:
GROUP BY department_idthen it gives the average for all employees.
Thanks!
Message was edited by:
user526807

Answer 1

Your sub-query is not really correlated.
You should join it by deptno with exetrnal query
SELECT ename||' '||job,
       deptno,
       sal
FROM scott.emp e
WHERE sal > (SELECT AVG (sal)
                FROM scott.emp
                where deptno = e.deptno
                GROUP BY deptno);ENAME||''||JOB DEPTNO SAL
ALLEN SALESMAN      30     1600
JONES MANAGER      20     2975
BLAKE MANAGER      30     2850
SCOTT ANALYST      20     3000
KING PRESIDENT      10     5000
FORD ANALYST      20     3000