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kissCode
V2EX  ›  MySQL

对于没有索引的字段执行模糊查询,执行时间疑问

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  •   kissCode · Apr 8, 2020 · 3261 views
    This topic created in 2365 days ago, the information mentioned may be changed or developed.

    语句 a: SELECT * FROM bbs_topic topic WHERE topic.content LIKE "%蜜蜂%" LIMIT 1, 20;

    语句 b: SELECT * FROM bbs_topic topic WHERE topic.content LIKE "%蜜蜂" LIMIT 1, 20;

    语句 c: SELECT * FROM bbs_topic topic WHERE topic.content LIKE "蜜蜂%" LIMIT 1, 20;

    字段 content 没有加索引,分析执行计划都一样,为什么执行时间 a<c<b?

    1 replies  •  2020-04-08 15:12:53 +08:00
    Vegetable
        1
    Vegetable  
       Apr 8, 2020
    可能和有样本本身有关系? 先取到 20 条的自然就先结束了.
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