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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', ' ');

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出自：Oracle认证

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