如图所见，排序时是根据了两个不同表的两个不同字段，a是主表，b是副表，两个排序的字段在自己所属的表中都创建了索引。
排序的字段换成主表创建过索引的字段是可以生效的，如果换成副表创建过索引的字段就无效了
当前位置：网站首页>mysql排序索引失效？
mysql排序索引失效？
2022-07-17 17:25:00 【segmentfault】
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