เมืองใดมีลูกค้าอาศัยอยู่มากที่สุด?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
Which city has the most customers living in?It is not neccessary to use all the tables.
 customers:  (customer_id [ VARCHAR) ]
SELECT t3.city FROM customers AS t1 JOIN customer_addresses AS t2 ON t1.customer_id = t2.customer_id JOIN addresses AS t3 ON t2.address_id = t3.address_id GROUP BY t3.city ORDER BY COUNT(*) DESC LIMIT 1