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mysql---左连接、右连接、内连接之间的区别与联系_MySQL

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Release: 2016-06-01 13:08:46
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现有两张表

第一张表为男生表,记录了男生的姓名和配偶的编号

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第二张表为女生表,记录了女生的姓名和自己的编号

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第一种情况:

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