สำนักงานใหญ่ของร้านแบล็กวิลล์คือเมืองใด?ไม่จำเป็นต้องใช้ตารางทั้งหมด
What city is the headquarter of the store Blackville?It is not neccessary to use all the tables.
 district:  district_id [ number]  district_name [ text]  headquartered_city [ text]  city_population [ number]  city_area [ number] 
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"