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mysql的left join索引只使用join的表的索引？
    如图，为什么tb_moment的momid是唯一索引，在explain发现却没使用到这个字段的索引，只用到了left join后面那个表的索引？有什么办法让主表tb_moment也走上索引。...
asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)
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