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In which two scenarios should you issue the following command？（） FLASHBACK TABLE SCOTT.EMP TO TIMESTAMP SYSTIMESTAP- INTERVAL ’15’ MINUTE；
A: when the schema of the user， SCOTT， was deleted by mistake 15 minutes ago
B: when the table EMP of the SCOTT schema was dropped by mistake 15 minutes ago
C: when some rows of the table， EMP， in the SCOTT schema were deleted by mistake 15 minutes ago
D: when some incorrect values were inserted in the EMP table in the user Scott’s schema during the last 15 minutes
E: never， because FLASHBACK TABLE is not a valid command in Oracle 10g.

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出自：Oracle认证

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