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【单选题】
You work as a database administrator at Certkiller .com. You are working in an online transaction processing （OLTP） environment. You realize that the salary for an employee， John， has been accidentally modified in the EMPLOYEEStable. Two days ago， the data was in the correct state. Flashback logs generated during last two days are available in the flash recovery area. Which option would you choose to bring the data to the correct state while ensuring that no other data in the same table is affected？（）A.
perform point-in-time recovery
B.
perform a Flashback Table operation to restore the table to the state it was in two days ago
C.
perform a Flashback Database operation to restore the database to the state it was in two days ago
D.
perform Flashback Versions Query and Flashback Transaction Query to determine all the necessary undo SQL statements， and then use them for recovery
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【单选题】2 发票上的货物数量应与信用证一致,如信用证在数量前使用“约”、“大约”字眼时,应理解为
A.
货物数量有不超过 5% 的增减幅度
B.
货物数量有不超过 10% 的增减幅度
C.
货物数量有不超过 3% 的增减幅度
D.
货物数量不得增减
【简答题】根据增加或减少实体,“拉伸”实体特征分为 和 。
【单选题】发票上的货物数量应与信用证一致,如信用证在数量前使用“约”、“大约”字眼时,应理解为:( )
A.
货物数量有不超过10%的增减幅度
B.
货物数量有不超过5%的增减幅度
C.
货物数量不得增减
D.
货物数量有不超过3%的增减幅度
【简答题】根据增加或减少实体，“拉伸”实体特征分为凸台和 。