เครือร้านค้าภาคใต้มีกี่ห้างสรรพสินค้า?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
How many department stores does the store chain South have?It is not neccessary to use all the tables.
 department_stores:  (dept_store_chain_id [ VARCHAR) ]
SELECT COUNT(*) FROM department_stores AS T1 JOIN department_store_chain AS T2 ON T1.dept_store_chain_id = T2.dept_store_chain_id WHERE T2.dept_store_chain_name = "South"