How to use aggregate function in where clause

Question

I'm getting below error while using aggregate function in where clause.

'An aggregate may not appear in the where clause unless it is a subquery contained in a having clause or a select list, and the column being aggregated is an outer referrence'.

Query :

Select a.*,b.* 
from address a 
join account c on a.acct_no=b.acct_no 
where a.stop_date in (select max(a.stop_date) 
                      from address x 
                      where x.acct_no=a.acct_no and x.addr_code=a.addr_code)

Please suggest how to deal with it

Answer 1

You should use x.stop_date instead of a.stop_date :

Select a.*,b.* 
from address a 
join account b on a.acct_no=b.acct_no 
where a.stop_date in (select max(x.stop_date) 
                      from address x 
                      where x.acct_no=a.acct_no and x.addr_code=a.addr_code)