Letf join ,right join,inner join的区别
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Letf join ,right join,inner join的区别
Left join 表a on a.a=b.b
以表a为基础,会将表a的数据全部显示,表b不符合条件的会用null来填充
Right join 表a on a.a=b.b
以表b为基础,会将表b的数据全部显示,表a不符合条件的会用null来填充
Inner join 表a on a.a=b.b
会显示所有符合a.a=b.b的数据,不以任何表为基础
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