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What is true regarding subqueries?（）
A:The inner query always sorts the results of the outer query.
B:The outer query always sorts the results of the inner query.
C:The outer query must return a value to the inner query.
D:The inner query returns a value to the outer query.
E:The inner query must always return a value or the outer query will give an error.

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出自：Oracle认证

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