Which three statements about sub
题目
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.
