连表查询能够跟多个条件

连表查询时后面条件能够跟多个条件 select * from tabA a,tabB b where a.userID=b.userID and a.userName=b.userName select * from tabA a left join tabB b on a.userID=b.userID and a.userName=b.userName where …… 连表查询时on后面能

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