Get 0 value from a count with no rows

Question

I have SELECT:

SELECT c FROM (
    SELECT "candidate_id" as id, count("candidate_id") as c
    FROM "Applicaions"
    GROUP BY &         


        

Answer 1

Perhaps:

SELECT CASE c WHEN NULL THEN 0 ELSE c END
    FROM (
    SELECT "candidate_id" as id, count("candidate_id") as c
    FROM "Applicaions"
    GROUP BY "candidate_id"
) as s WHERE id= _SOME_ID_;

assuming that the 'nothing' is really NULL