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mysql求平均排队时长

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Release： 2016-06-06 20:08:52
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mysql求平均排队时长
就是把所有的时间差相加 除以排队数 但是mysql怎么写呢

mysql求平均排队时长

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mysql求平均排队时长
就是把所有的时间差相加 除以排队数 但是mysql怎么写呢

mysql求平均排队时长

难道不是select sum(字段)/count(1) from table?
mysql求平均排队时长

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