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Which three statements about subqueries are true? （）
A:A single row subquery can retrieve only one column and one row.
B:A single row subquery can retrieve only one row but many columns.
C:A multiple row subquery can retrieve multiple rows and multiple columns.
D:A multiple row subquery can be compared using the ">" operator.
E:A single row subquery can use the IN operator.
F:A multiple row subquery can use the "=" operator.

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出自：Oracle认证

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