mysql資料庫各種join的使用結果展示
阿新 • • 發佈：2019-02-05
這裡只包含了常用的幾種；
user表：
user_1011表：
select * from user u0 left join user_1011 u1 on u1.name = u0.name;
select * from user u0 left join user_1011 u1 on u1.name = u0.name where u1.name is not null;
select * from user u0 left join user_1011 u1 on u1.name = u0.name and u1.name is not null;
select * from user u0 left join user_1011 u1 on u1.name = u0.name where u1.name is null;
select * from user u0 inner join user_1011 u1 on u1.name = u0.name;
a left join b = b right join a 總結：
mysql不支援outer join