Using Subquery returns more than 1 ROW.Please guide

Question

Hi
I am using inner join to return back a row
Now,when I use the sub query.I get the message:
ORA_01427 : Single row subquery returns more than one row
select t.trade_id from trade t
inner join prod_desc p
on t.product_id = p.product_id
  inner join trade_keyword k
     on t.trade_id = k.trade_id
     where t.trade_status in( 'PENDING_TERM','TERMINATED')
     and k.trade_id = (Select trade_id from trade_keyword
                    where keyword_name like '%FeeConfirmed%'
                 and keyword_value = 'true')I was wondering if I need to use a join in the subquery
like
= (Select trade_id from trade_keyword
                    where keyword_name like '%FeeConfirmed%'
                 and keyword_value = 'true'
                       and trade_id = t.trade_id)Or is there a better way?
Please advise

Answer 1

You need to use the "IN" operator instead of the equals sign "=".
as in
and k.trade_id in (your subselect)However I just noticed, that maybe you don't need a subselect at all. You already joined the keyword table. There is no reason to select from it a second time. Of course this depends on your data and what do you want to select.
select t.trade_id from trade t
inner join prod_desc p on t.product_id = p.product_id
inner join trade_keyword k on t.trade_id = k.trade_id
where t.trade_status in( 'PENDING_TERM','TERMINATED')
and k.keyword_name like '%FeeConfirmed%'
and k.keyword_value = 'true';Edited by: Sven W. on Sep 1, 2008 5:36 PM