这个sql怎么写？

回复讨论(解决方案)

select * from A left join B on A.id=B.id;

select * from A,B where A.id=B.id

SELECT A.id AS `aid` , A.name AS aname , B.p_id AS pid , B.id AS bid , B.session AS bsession FROM A,B WHERE A.aid=B.bid

select * from A left join B on A.id=B.id;

selact * from a left join (select * from b where session='aaa') t on a.id=t.id