Report query to exclude entries from the list.

Question

ID R_Number Status_ID Date Setup_by
12 1111 2 11/11/2006 m
23 2222 4 11/11/2006 m
54 1111 3 11/12/2006 m
54 1111 5 11/11/2006 m
876 3333 2 11/13/2006 m
89 4444 4 11/11/2006 m
33 2222 2 11/14/2006 m
How can I select the R_number where status_id ‘2’ exist but not status_id ‘4’ (If one r_number has both status_id ‘2’ and ‘4’, it should not pick that number)
I tried the query below but it seems to be returning the r_number (S) where it has either 2 or 4 status_id.
Select r_number, status_id
From table1
Where status_id = ‘2’
And status_id != ‘4’
so that it should be picking r_number (s) - 1111, 3333 only
Please help me out. Thank you. Rav.

Answer 1

Well, this is really a SQL question, not an ApEx question, but here goes....
Your query would return r_number and status_id from any record that contains a status_id of 2 and not 4. Well, if it's 2, it can't be 4, so it's really returning any record where status_id is 2, which would be rows with ID 12, 876, and 33. What I think you want is a query where you find a status_id of 2 and no other record in the database has the same r_number only with a status_id of 4.
Try
select r_number, status_id from table1
where status_id = '2'
and r_number not in (select r_number from table1 where status_id = '4')
This works, but may not be the most efficient query.