Query Please Urgent

Question

SELECT DISTINCT icms_task_assigned.task,icms_task_department.task_department,icms_assigned_to.assigned_to,to_char(icms_task_assigned.target_date,'DD-Mon-YYYY') AS target_date,call_status,icms_task_assigned.remarks,icms_task_assigned.task_id FROM icms_task_assigned LEFT JOIN icms_task_department ON icms_task_department.task_department_id = icms_task_assigned.department LEFT JOIN icms_assigned_to ON icms_assigned_to.assigned_to_id = icms_task_assigned.assigned_to WHERE icms_users.user_id = 1 AND to_char(icms_task_assigned.assigned_date,'YYYY-MM-DD') >= '2006-07-01' AND to_char(icms_task_assigned.assigned_date,'YYYY-MM-DD') <= '2006-07-14' ORDER BY UPPER(target_date)
The error is
ERROR: for SELECT DISTINCT, ORDER BY expressions must appear in select list

Answer 1

You can't use the alias in the order by clause. And what about :
SCOTT@demo102> select ename,
  2                   case when sal >= 30000 then 'Very high'
  3                        when sal >= 20000 then 'High'
  4                        when sal >= 10000 then 'Medium'
  5                        else 'Low' end as SalStatus
  6            from emp
  7            order by SalStatus;
ENAME      SALSTATUS
CLARK      High
BLAKE      High
JONES      High
JAMES      Low
SMITH      Low
ALLEN      Medium
WARD       Medium
MILLER     Medium
MARTIN     Medium
TURNER     Medium
ADAMS      Medium
SCOTT      Very high
FORD       Very high
KING       Very high
14 rows selected.
SCOTT@demo102> Nicolas.