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In which scenario will you use the Flashback Transaction Query feature？（）
A: when you want to restore an important table that is dropped from the Recycle Bin
B: when you want to obtain the SQL statements to undo the deletion of some important records from a table by a transaction
C:when you want to restore a dropped user’s schema
D: when a row of a table is updated many times within a specific time period and you want all the versions of the row in the specified time period

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出自：Oracle认证

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