多表查询时,mysql语句为:
select a.*,b.* from 表A名 as a left join 表B名 as b on a.字段名=b.字段名;
当出现两个相同字段名字时,比如相同字段名为name,就可以a.name as aname,b,name as bname;
语句为:
select a.name as aname,b.name as bname from as a left join 表B名 as b on a.字段名=b.字段名;
2022-05-07 01:21:35
多表查询时,mysql语句为:
select a.*,b.* from 表A名 as a left join 表B名 as b on a.字段名=b.字段名;
当出现两个相同字段名字时,比如相同字段名为name,就可以a.name as aname,b,name as bname;
语句为:
select a.name as aname,b.name as bname from as a left join 表B名 as b on a.字段名=b.字段名;