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 EMPLOYEES table. 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？（） ["perform point-in-time recovery","perform a Flashback Table operation to restore the table to the state it was in two days ago","perform a Flashback Database operation to restore the database to the state it was in two days ago","perform Flashback Versions Query and Flashback Transaction Query to determine all the necessary undo SQL statements， and then use them for recovery"]
变电所为消除、限制高次谐波对电能质量的影响需装设（）。 ["并联电抗器","消弧线圈","串联电抗器"]
What does the TRUNCATE statement do?（） [" Removes the table"," Removes all rows from a table"," Shortens the table to 10 rows"," Removes all columns from a table"," Removes foreign keys from a table"]
变配电所常采用的电源引入方式为T接和（）接。
You have issued a SHUTDOWN ABORT command to bring down your database instance. Consider the stepsthat will be performed later when you open the database： 1. SGA is allocated. 2. Control file is read. 3. Redo log files are read. 4. Instance recovery is started. 5. Background processes are started. 6. Data files are checked for consistency. 7. Server parameter file or the initialization parameter file is read. Which option has the correct order in which these steps occur（） ["7， 1， 5， 2， 3， 6， 4","1， 2， 3，7， 5， 6， 4","7， 1， 4， 5， 2， 3， 6","1， 7， 5， 4， 2， 3， 6"]
简述结构游戏的指导要点。
