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mysql三表连接查询有关问题

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Release: 2016-06-13 11:34:26
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mysql三表连接查询问题
三表左连接查询,为何会出现重复数据,有木有大神讲解一下原因啦啦啦啦!比如现在我单独查询有九条记录,但是还需要其他附属表的字段,结果连接查询出现重复数据,总数也是九条,这是神马情况啊?

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