Andreas I tried to rewrite it with the function rank() but I failed. The query you wrote isnt the same as what I search. Moreover, I cant use explain analyze because it is taking to much time to run and I'm getting timeout..
Hi, I need to use the max function in my query. I had very bad performance when I used the max :
SELECT Ma.User_Id, COUNT(*) COUNT FROM Manuim Ma WHERE Ma.Bb_Open_Date = (SELECT max(Bb_Open_Date) FROM Manuim Man WHERE Man.User_Id = Ma.User_Id ) GROUP BY Ma.User_Id HAVING COUNT(*) > 1;
Any idea how can I continue from here ? Thanks , Mariel.
Maybe you can rewrite it, for instance to
select distinct on (user_id, bb_open_date) user_id, bb_open_date, count(1) from Manuim group by 1,2 having count(1) > 1;
maybe much cheaper, but untested! If not, please share more details, at least table-definition.