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为什么有时候 group by 加会比不加快那么几毫秒？

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  •   thankyourtender · Jul 28, 2014 · 2789 views
    This topic created in 4333 days ago, the information mentioned may be changed or developed.
    为什么有时候group by 加会比不加快那么几毫秒？
  • 加快
  • Group
  • 毫秒
    1 replies  •  2014-07-28 21:25:40 +08:00
    Mac
        1
    Mac  
       Jul 28, 2014
    GROUP BY么数据就合并输出了呀，这几毫秒就是数据输出时候的差距吧。
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