Table_A Table_B Table_A a Table_B b on a.Code = b.Code Table_A Table_B Table_A a right join Table_B b on a.Code = b.Code 完整外部联接返回Table_A和Table_b中的所有行。当Table_A在Table_B表中没有匹配行时， Table_A Table_B Table_A a full join T
Table_A Table_B Table_A a Table_B b on a.Code = b.Code Table_A Table_B Table_A a right join Table_B b on a.Code = b.Code 完整外部联接返回Table_A和Table_b中的所有行。当Table_A在Table_B表中没有匹配行时，服务器空间， Table_A Table_B Table_A a full join Table_B b on a.Code = b.Code Table_A Table_B Table_A a join Table_B b on a.Code = b.Code Table_A Table_B (*) from Table_A a cross join Table_B Table_A a cross join Table_B ，虚拟主机，空间