ขอแผนภูมิแท่งเพื่อเปรียบเทียบจำนวนแผนกที่ตั้งอยู่ในเมืองต่างๆ ไม่จำเป็นต้องใช้ตารางทั้งหมด
Give me a bar chart to compare the number of departments located in different cities.It is not neccessary to use all the tables.
 employees:  EMPLOYEE_ID [ decimal(60)]  FIRST_NAME [ varchar(20)]  LAST_NAME [ varchar(25)]  EMAIL [ varchar(25)]  PHONE_NUMBER [ varchar(20)]  HIRE_DATE [ date]  JOB_ID [ varchar(10)]  SALARY [ decimal(82)]  COMMISSION_PCT [ decimal(22)]  MANAGER_ID [ decimal(60)]  DEPARTMENT_ID [ decimal(40)] 
SELECT CITY, COUNT(CITY) FROM locations GROUP BY CITY