สร้างแผนภูมิวงกลมแสดงจำนวนสำนักงานใหญ่ทั่วสำนักงานใหญ่ ไม่จำเป็นต้องใช้ตารางทั้งหมด
Create a pie chart showing how many headquarters across headquarters.It is not neccessary to use all the tables.
 company:  Company_ID [ int]  Rank [ int]  Company [ text]  Headquarters [ text]  Main_Industry [ text]  Sales_billion [ real]  Profits_billion [ real]  Assets_billion [ real]  Market_Value [ real] 
SELECT Headquarters, COUNT(Headquarters) FROM company GROUP BY Headquarters