单项选择题 You are working as a Database Administrator. You erroneously dropped an important table named WAREHOUSE_DETAILS. The table resides in a non-SYSTEM tablespace.  The following dependent objects have been defined on the dropped table：       Due to limited space， some of the indexes and triggers have been removed from the Recycle Bin. You decide to recover the table by using Flashback Drop. You execute the following statement： SQL>FLASHBACK TABLE warehouse_details TO BEFORE DROP；   What will be the implication of executing this statement？（）

多项选择题 OnJan11，2005at2：30P.M.，anerroneousupdateoperationmodifiedallthevaluesofcolumnLASTNAMEintheEMPLOYEEtableintheScottschematoanemptystring.Youarethesystemadministrator，andyouwanttoreturntheoriginalvaluesinthetable.Todoso，youdecidedtoflashbackthetable.Whichtwooptionscanyouusetoflashbackatable？（）

单项选择题 YouwanttousetheFlashbackTransactionQueryfeaturetoidentifyallthechangesmadetoyourdatabasewithinaspecifictimeperiod.WhatisaprerequisiteforusingtheFlashbackTransactionQueryfeature？（）