题解 | #确定最佳顾客的另一种方式（二）#

SELECT cust_name, SUM(item_price * quantity) AS total_price
FROM Customers
INNER JOIN Orders USING(cust_id)
INNER JOIN OrderItems USING(order_num)
GROUP BY cust_name
HAVING total_price >= 1000;

分组这里，必须要是被select的作为分组标准，这就是为什么使用cust_name