Subject Re: best query to find the first row ordering by a column, with a constraint
Author korkless
the query execution time now is less than 1/4 of previous :)

i understand why use an index also in source_id (there're about 200 different source ids), my question was why i need to order also by source-id desc but i think that i must read more on how multiple index works to udnerstand it.

anyhow thanks all, now the responce time is perfect.