align main keywords

align main keywords

DELETE FROM job_history jh  
WHERE  employee_id = (SELECT employee_id  
                      FROM   employee e  
                      WHERE  jh.employee_id = e.employee_id  
                             AND start_date = (SELECT Min(start_date)  
                                               FROM   job_history jh  
                                               WHERE  jh.employee_id = e.employee_id)  
                             AND 5 > (SELECT Count( * )  
                                      FROM   job_history jh  
                                      WHERE  jh.employee_id = e.employee_id  
                                      GROUP  BY employee_id  
                                      HAVING Count( * ) >= 4));