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INSERT INTO employees (employee_id, first_name, last_name, email, phone_number, hire_date, job_id, salary, manager_id, department_id) VALUES (1, 'John', 'Doe', john.doe@example.com', '123456789', '2023-01-01', 1, 50000, NULL, 1),(2, 'Jane', 'Smith', jane.smith@example.com', '987654321', '2023-01-15', 2, 60000, 1, 1),(3, 'Michael', 'Taylor', michael.taylor@example.com', '555555555', '2023-02-01', 3, 70000, 2, 2),(4, 'Emily', 'Brown', 'emily.brown@example.com', '333333333', '2023-02-15', 3, 80000, 1, 2),(5, 'David', 'Johnson', 'david.johnson@example.com', '111111111', '2023-03-01', 4, 90000, 2, 3);