以下Maxcompute SQL()效率最高。
(A)select * from (select * from A where dt=20140301)A`left outer join B on B.id=A.id
(B)没有区别
(C)select * from A left outer join B on B.id=A.id and A.dt=20140301
(D)select * from A left outer join B on B.id=A.id where A.dt=20140301
参考答案
继续答题:下一题