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mysql基本知识点梳理和查询优化 - 陈芳志
source link: https://www.cnblogs.com/chenfangzhi/p/9979676.html
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[TOC] 本文主要是总结了工作中一些常用的操作，以及不合理的操作，在对慢查询进行优化时收集的一些有用的资料和信息，本文适合有mysql基础的开发人员。 一、索引相关 1. 索引基数：基数是数据列所包
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