Sql Queries - adding calculated variables to views

Question

Hello:
I'm trying to do add a calculated variable to my view that isn't an Entity
Attribute, its simple really but i don't know if I'm leaving something out or
not.
I add the "new Attribute" , call it nCompleted, type - number
I then check off everything as is required(as documented in Help)
for an Sql Derived Attribute, the following code is entered in the
Expression Box :
Select group_services.office, count(client_group_services.clnt_group_services_id) as nCompleted
Where group_services_id=client_group_services_id(+)
And client_group_services_id.result="Completed";
It isn't working, what am I missing????

Answer 1

Hello:
I'm trying to do add a calculated variable to my view that isn't an Entity
Attribute, its simple really but i don't know if I'm leaving something out or
not.
I add the "new Attribute" , call it nCompleted, type - number
I then check off everything as is required(as documented in Help)
for an Sql Derived Attribute, the following code is entered in the
Expression Box :
Select group_services.office, count(client_group_services.clnt_group_services_id) as nCompleted
Where group_services_id=client_group_services_id(+)
And client_group_services_id.result="Completed";
It isn't working, what am I missing???? Sheena:
It probably isn't working because of missing 'group by' clause. I don't know the exact detail of your query statement, but suppose you want to count number of employees in a dept, then you're query should look like:
select dept.deptno, dept.dname, count(emp.empno) as nCount
   from dept, emp where dept.deptno = emp.deptno(+)
   group by dept.deptno, dept.dname  // This group-by is important
OR if you want to use nested SELECT
select dept.deptno, dept.dname,
   (select count(emp.empno) from emp where dept.deptno=emp.deptno(+)) as nCount
   from dept