Question

I want to return a count value in the resultset. This count value uses a different condition from the main query. Is it possible to acheive this using sub-query i.e., in a single query?

SELECT ID, DESC, 
(SELECT COUNT(*) FROM TABLE1 WHERE TABLE1.ID=ID AND STATUS_ID=2) 
COUNT FROM TABLE1 WHERE STATUS_ID=6

Answer 1

Yes.

However, if you use the same table more than once in a query / subquery, you should use different aliases, to be clear what exactly you are selecting or comparing

SELECT t1.ID, t1.DESC, 
  ( SELECT COUNT(*)
    FROM TABLE1 t2
    WHERE t1.ID=t2.ID AND t2.STATUS_ID=2) COUNT 
FROM TABLE1 t1
WHERE t1.STATUS_ID=6