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苦逼，下班了，遇到一个 SQL 查询慢的问题，和同事讨论很久，结果用代码解决了
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MySQL - @stevenkang - 情况是这样的，mysql 5.7.14-log，有两个表，A 表 2000w 条数据，B 表 1000w 条数据。现有需求：select a.x, b.x from A a left join
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