ค้นหาจำนวนร้านค้าในแต่ละเมือง ลงจุดเป็นแผนภูมิแท่ง ไม่จำเป็นต้องใช้ตารางทั้งหมด
Find the number of stores in each city. Plot them as bar chart.It is not neccessary to use all the tables.
 store_district:  Store_ID [ int]  District_ID [ int] 
SELECT Headquartered_City, COUNT(*) FROM store AS t1 JOIN store_district AS t2 ON t1.Store_ID = t2.Store_ID JOIN district AS t3 ON t2.District_ID = t3.District_ID GROUP BY t3.Headquartered_City