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文章 2017-09-07 来自：开发者社区

SQL语句效率问题的几点总结 <转>

1. SQL优化的原则是：将一次操作需要读取的BLOCK数减到最低,即在最短的时间达到最大的数据吞吐量。调整不良SQL通常可以从以下几点切入：检查不良的SQL，考虑其写法是否还有可优化内容检查子查询考虑SQL子查询是否可以用简单连接的方式...

问答 2016-06-16 来自：开发者社区

sql语句的联表查询的效率问题

这两种哪一种效率更高呢 , 推荐使用哪一种? 第二种叫内连接 , 第一种方式叫什么来着?忘记了 ....

问答 2016-02-11 来自：开发者社区

sql语句引起的效率问题，如何修改？

我的sql语句存在效率问题原来的语句是： a_id虽然是主键也是索引，但是并未起到索引作用经过优化后的语句: 各位的看法如何？

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更新时间 2022-09-09 09:58:26

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