左链接Column 'id' in field list is ambiguous
2016-11-22 12:27
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如题错误如左链接Column 'id' in field list is ambiguous
今天在写sm的时候,用到两个表的联合查询出现的如下的错误,仔细查找才发现原来两个表的id重复了,user表中的主键是id,device中的主键也是id,当他们进行连接时候就会出现列重复,也就是id重复。解决办法1.修改其中一个表的主键名字2.查询的时候用别名限制是那一个表的。
今天在写sm的时候,用到两个表的联合查询出现的如下的错误,仔细查找才发现原来两个表的id重复了,user表中的主键是id,device中的主键也是id,当他们进行连接时候就会出现列重复,也就是id重复。解决办法1.修改其中一个表的主键名字2.查询的时候用别名限制是那一个表的。
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