Which three statements are true about a self join?
A.It can be an outer join B.The ON clause can be used C.The query must use two different aliases for the table D.It must be an equijoin E.It must be an inner join F.The ON clause must be used正确答案ABC
Which three statements are true about a self join?
A.It can be an outer join B.The ON clause can be used C.The query must use two different aliases for the table D.It must be an equijoin E.It must be an inner join F.The ON clause must be used正确答案ABC
