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'
For the following select:
SELECT DISTINCT badge_history.xact_date AS xact_date,
badge_history.xact_time AS xact_time, badge_history.last_name AS
last_name, badge_history.bid AS bid, badgests.cond_desc AS status,
department.description AS department, badge_history.reader_desc AS
reader_desc, area.
