[英]optimize query with group by and sum
以下查询执行8秒
SELECT `currency`, sum(amount) as amount
FROM `p_transactions`
WHERE `member_id` = 2051
AND `transaction_type` = 'debit'
AND `transaction_status` = 12
GROUP BY `currency`
但是如果删除GROUP BY currency
部分,则最多会缩短2秒。 有什么办法可以加快查询速度吗?
索引是复合的(member_id,transaction_type,transaction_status)。
尝试将索引更改为:
(member_id, transaction_type, transaction_status, currency)
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.