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You have created a password file using the following command：  
ORAPWD file=d：\oracle\ora9i\orapwU01 password=change_on_install entries=3  
Which of the following is true about this password file？（）

Examine the data from the EMP table: The COMMISSION column shows the monthly commission earned by the employee.Which three tasks would require subqueries or joins in order to perform in a single step?（） Deleting the records of employees who do not earn commission.。 Increasing the commission of employee 3 by the average commission earned in department 20.。 Finding the number of employees who do NOT earn commission and are working for department 20.。 Inserting into the table a new employee 10 who works for department 20 and earns a commission that is equal to the commission earned by employee 3.。 Creating a table called COMMISSION that has the same structure and data as the columns EMP_ID and COMMISSIONS of the EMP table.。 Decreasing the commission by 150 for the employees who are working in department 30 and earning a commission of more then 800.。 下列类型中，不包括在消费者类型中的有（） 耐心购买者。 分析购买者。 冲动购买者。 兴趣购买者。 食品卫生标准中有哪些微生物学的指标？有哪些食品卫生学意义？ You perform a backup using the following BACKUP command: RMAN> BACKUP AS COMPRESSED BACKUPSET DATABASE,Which statement is true of this command?（） A different procedure is required to restore a database from compressed backups 。 The AS COMPRESSED clause of the BACKUP command provided by RMAN is used to create compressed backup sets and image copies. 。 Using this command to create backups minimizes the bandwidth consumed.。 Using this command to create backups improves the performance of the backup process&e。 检察机关不起诉决定作出后，如果被不起诉人在押，应当（） 取保候审。 监视居住。 监外执行。 立即释放。

You have created a password file using the following command：  
ORAPWD file=d：\oracle\ora9i\orapwU01 password=change_on_install entries=3  
Which of the following is true about this password file？（）