问题

Which three statements about subquerie

Which three statements about subqueries are true? （）

A A main query can have more than one subquery.
B A subquery can have more than one main query.
C The subquery and main query must retrieve data from the same table.
D The subquery and main query can retrieve data from different tables.
E Only one column or expression can be compared between the subquery and main query.
F Multiple columns or expression can be compared between the subquery and main query.

参考答案

参考解析：

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