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distinct跟group by 的效率比较

WBOY
Release： 2016-06-13 11:28:40
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distinct和group by 的效率比较？
不是区别哈，是效率，说说为什么distinct或者group by效率就高啊，不是很明白。。。。。。。。 

Related labels：
distinct nbsp
source：php.cn
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