###HUMAN: For those employees who was hired before 2002-06-21, return a bar chart about the distribution of job_id and the sum of employee_id , and group by attribute job_id, and I want to sort by the y-axis in desc., ###ASSISTANT: SELECT JOB_ID, SUM(EMPLOYEE_ID) FROM employees WHERE HIRE_DATE < '2002-06-21' GROUP BY JOB_ID ORDER BY SUM(EMPLOYEE_ID) DESC