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.
正确答案:D
答案解析:有
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