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Optimize mysql query SELECT with single shop


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I can see query like this :


SELECT `id_connections` FROM `ps_connections` WHERE ip_address = 1123634193 AND DATE_ADD(`date_add`, INTERVAL 30 MINUTE) > '2014-01-19 18:11:00' AND id_shop IN (1) ORDER BY `date_add` DESC LIMIT 1


I have 1 shop, so I guess its useless to append "AND id_shop IN(1)" all the time (I mean to improve my mysql performance a bit)?


(Also index is missing for the column ps_connections.ip_address, and ip_address should be a UNSIGNED INT.

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