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’,‘’)