出自:Oracle认证
Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) Which three statements insert a row into the table? （）
A:INSERT INTO employees VALUES ( NULL, 'John', 'Smith');
B:INSERT INTO employees( first_name, last_name) VALUES( 'John', 'Smith');
C:INSERT INTO employees VALUES ( '1000', 'John', NULL);
D:INSERT INTO employees (first_name, last_name, employee_id) VALUES ( 1000, 'John', 'Smith');
E:INSERT INTO employees (employee_id) VALUES (1000);
F:INSERT INTO employees (employee_id, first_name, last_name) VALUES ( 1000, 'John', ' ');
Given below are the steps to recover from the error in random order: 1: Shut down the instance, if not already done. 2: Copy one of the remaining control files to a new location. 3: Change the value of the CONTROL_FILES initialization parameter to correspond to the new location of the control files. 4: Start up the database instance to the NOMOUNT stage. 5: Recover the database to the point of failure of the control file. 6: Open the database. Identify the correct sequence of steps（ ） 
Which is true？（）
What is the result？（）
You made changes to the COMPUTE_TAX function inside the EMP_ADMIN package body. Whichstatement is true after you recompile the EMP_ADMIN package body（）