sql，SELECT customer_id, SUM(order_amount) AS total_amount，FROM orders，GROUP BY customer_id;，``，，这段代码将返回每个客户的总订单金额。sql，SELECT customer_id, SUM(order_amount) AS total_amount，FROM orders，GROUP BY customer_id;，``，，这段代码将返回每个客户的总订单金额。Powered By Z-BlogPHP 1.7.3