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优化以下SQL查询的任何想法?运行需要相当长的时间。通常大约3-8秒,取决于它是哪种产品。优化MySQL查询 - 运行时间长
SELECT
`serviceid`
FROM
`services`
INNER JOIN `products` ON `serviceid`=products.`id`
WHERE
`orderid` IN
(
SELECT `orderid` FROM `orders_items`,`orders`
WHERE
`orderid`=orders.`id` AND
`status` > '2' AND
`serviceid`='___SYSTEM_VARIABLE___'
)
AND NOT
`serviceid`='___SYSTEM_VARIABLE___' AND
products.`state`='1' AND
products.`stock` > 0
GROUP BY
`serviceid`
ORDER BY
COUNT(`serviceid`) DESC LIMIT 15
谢谢!
你可能会需要向我们展示SHOW的'输出CREATE TABLE'每个上面提到的表,以及' EXPLAIN SELECT'用于该查询。 – whamma