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Re: how to optimize this sql?
Posted by: h h
Date: July 12, 2016 09:08PM

root@localhost:legend 11:00:26>select count(distinct(is_deleted)) from legend_account_coupon\G
*************************** 1. row ***************************
count(distinct(is_deleted)): 2
1 row in set (0.19 sec)

root@localhost:legend 11:02:16>select count(distinct(shop_id)) from legend_account_coupon\G
*************************** 1. row ***************************
count(distinct(shop_id)): 289
1 row in set (0.26 sec)

shop_id ,is_deleted column has not very much different value,actually there are very loooooong list in IN clause

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h h
July 07, 2016 07:38PM
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July 08, 2016 10:59AM
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h h
July 12, 2016 09:01PM
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July 09, 2016 11:04PM
Re: how to optimize this sql?
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h h
July 12, 2016 09:08PM
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July 14, 2016 12:52PM


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