Question

select 
    A.ACCT as acct, COUNT(TRANS_key) as payments
from 
    DEBT A 
join 
    TRANS B on B.DEBT_KEY = A.DEBT_KEY
join 
    TRANS_CODE C on C.TRANS_CODE = B.TRANS_CODE
join 
    CLIENT D on D.CLIENT_KEY = A.CLIENT_KEY
join 
    STATUS S on S.STAT_KEY = A. STAT_KEY
where 
    S.CATEGORY = 'A' and D.CLIENT_KEY = 43

Error:

Cannot perform an aggregate function on an expression containing an
aggregate or a subquery.

I am getting the error above when running this. I am not sure if I should be joining these tables differently or not, but I need this to be working.

Answer 1

All other selects have to be group by. Use this

    select A.ACCT as acct, COUNT(TRANS_key) as payments

from DEBT A join TRANS B on B.DEBT_KEY = A.DEBT_KEY

join TRANS_CODE C on C.TRANS_CODE = B.TRANS_CODE

join CLIENT D on D.CLIENT_KEY = A.CLIENT_KEY

join STATUS S on S.STAT_KEY = A. STAT_KEY

where S.CATEGORY = 'A' and D.CLIENT_KEY = 43
GROUP BY A.ACCT