[单选]
You own a table called EMPLOYEES with this table structure: EMPLOYEE_ID NUMBER Primary Key
FIRST_NAME VARCHAR2(25)
LAST_NAME VARCHAR2(25)
HIRE_DATE DATE
What happens when you execute this DELETE statement? DELETE employees; （）

A . You get an error because of a primary key violation.
B . The data and structure of the EMPLOYEES table are deleted.
C . The data in the EMPLOYEES table is deleted but not the structure.
D . You get an error because the statement is not syntactically correct.

You are tuning RMAN to optimize performance.You want tape I/O to be asynchronous when you perform tape backups. Which action should you take?（） Set the BACKUP_TAPE_IO_SLAVES parameter to FALSE。 Set the BACKUP_TAPE_IO_SLAVES parameter to TRUE。 Use compression when performing tape backups。 Configure multiple SBT channel。中小学生的思想观点、个性品质，以及由此产生的行为方式都是受（）的影响和制约的。 You have a very large table that your users access frequently. Which of the following advisors will recommend any indexes to improve the performance of queries against this table?（） The Automatic Memory Manager (AMM)。 The SQL Tuning Advisor。 The Segment Advisor。 The SQL Access Advisor。小企业要尽快发展壮大，必须从创业初期就全力以赴注重创新。沃斯认为城市人口有三个特点有哪些。

You own a table called EMPLOYEES with this table structure: EMPLOYEE_ID NUMBER Primary Key
FIRST_NAME VARCHAR2(25)
LAST_NAME VARCHAR2(25)
HIRE_DATE DATE
What happens when you execute this DELETE statement? DELETE employees; （）

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[单选] You own a table called EMPLOYEES with this table structure: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE What happens when you execute this DELETE statement? DELETE employees; （）

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[单选]
You own a table called EMPLOYEES with this table structure: EMPLOYEE_ID NUMBER Primary Key
FIRST_NAME VARCHAR2(25)
LAST_NAME VARCHAR2(25)
HIRE_DATE DATE
What happens when you execute this DELETE statement? DELETE employees; （）