sql语句select*from A a,B b where a.bid=b.bid,查询结果等同于以下那条语句()。
A.select*from A a left join B b on a.bid=b.bid
B.select*from A a right join B b on a.bid=b.bid
C.select*from A a inner join B b on a.bid=b.bid
D.select*from A a inner join B b where a.bid=b.bid