摘要： create table tableA(tid int not null,mid int not null)goinsert into tableA values(2,2) insert into tableA values(3,3) insert into tableA values(4,4) insert into tableA values(5,5) create table tableB(fid int not null,tid int not null)goinsert into tableB values(1,2)insert into tableB values(1,3)inse 阅读全文