多选题

Which three statements are true regarding subqueries?()

ASubqueries can contain GROUP BY and ORDER BY clauses 

BMain query and subquery can get data from different tables 

CMain query and subquery must get data from the same tables 

DSubqueries can contain ORDER BY but not the GROUP BY clause 

EOnly one column or expression can be compared between the main query and subquery

F Multiple columns or expressions can be compared between the main query and subquery

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