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select * from stu s join class c on s.cid=cid 与此语句查询结果一致的是()
A.
select * from stu s left join class c on s.cid=c.cid;
B.
select * from stu s join class c on s.cid=c.cid;
C.
select * from stu s right join class c on s.cid=c.cid;
D.
select * from stu s join class c on s.sid=c.cid;