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多项选择题 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', 'smith');

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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