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Which statement is true regarding Flashback Version Query？（）
A: It returns versions of rows only within a transaction.
B: It can be used in subqueries contained only in a SELECT statement.
C: It will return an error if the undo retention time is less than the lower bound time or SCN specified.
D: It retrieves all versions including the deleted as well as subsequently reinserted versions of the rows.

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出自：Oracle认证

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