自学内容

查询 select o.order_code AS’订单号’, r.restaurant_name AS ‘饭店名’, o.eat_time AS’出单时间’, food_list AS’菜名’, unit_price AS’单价’, courier_name AS’快递员’ – COUNT(courier) AS’送单次数’, – SUM(unit_price)AS’送单总价’ from ord

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