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mysql-Left Join在大批量数据查询中如何优化

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Release： 2016-06-06 09:33:27
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mysql优化数据

Left Join在大批量数据查询中如何优化？具体表现为删除left join 时间大概为3秒，加上以后的时间为13秒。

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mysql 优化 数据
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