Question

I am running the following query but can’t seem to get the datediff() filter to work. The query is executing successfully but even if I change the datediff() to different values I still get the same result.

SELECT project_id
     , google_rank
     , COALESCE(
        ( SELECT google_rank
            FROM eig_ranking mi
           WHERE mi.project_id = m.project_id
           ORDER BY project_id limit 1
                 )
         , 0) - google_rank AS movement
     , keyword
     , domain
  FROM eig_ranking m
 WHERE (DATEDIFF(rank_date, NOW())) / 7 <= 12
   AND google_rank != 0
 ORDER BY movement DESC

Answer 1

thanks for your replies. I figured it out. I am not sure if its a MYSQL bug or documentation fault but interchanging the variables in the datediff() function to DATEDIFF(NOW(), rank_date) makes it work fine for all my queries and the results are all correct