สำนักงานใหญ่ของร้านชื่อ "แบล็ควิลล์" อยู่ที่เมืองใด?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
Which city is the headquarter of the store named "Blackville" in?It is not neccessary to use all the tables.
 store:  (store_id [ VARCHAR ] store_name [ VARCHAR) ]
SELECT t3.headquartered_city 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 WHERE t1.store_name = "Blackville"