OCP-1Z0-新051-61题版本-5

QUESTION NO: 5

Which three statements are true regarding subqueries? (Choose three.)

A. Multiple columns or expressions can be compared between the main query and sub query

B. Main query and sub query can get data from different tables

C. Sub queries can contain GROUP BY and ORDER BY clauses

D. Main query and sub query must get data from the same tables

E. Sub queries can contain ORDER BY but not the GROUP BY clause

F. Only one column or expression can be compared between the main query and subqeury

Answer: A,B,C

答案解析：

参考：135：http://blog.csdn.net/rlhua/article/details/12883417