Did you try EXPLAIN before SELECT?
http://www.mysql.com/documentation/mysql/bychapter/manual_Reference.html#EXPLAIN
Mike Baranski a écrit :
>
> For the following select:
>
> SELECT DISTINCT badge_history.xact_date AS xact_date,
(...)
--
Marc Delisle
Service de l'informatique
Collège de Sherbrooke, Québec
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