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;