问题

What is true regarding subqueries?（）

AThe inner query always sorts the results of the outer query.
BThe outer query always sorts the results of the inner query.
CThe outer query must return a value to the inner query.
DThe inner query returns a value to the outer query.
EThe inner query must always return a value or the outer query will give an error.

参考答案

参考解析：

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