自學內容

查詢 select o.order_code AS’訂單號’, r.restaurant_name AS ‘飯店名’, o.eat_time AS’出單時間’, food_list AS’菜名’, unit_price AS’單價’, courier_name AS’快遞員’ – COUNT(courier) AS’送單次數’, – SUM(unit_price)AS’送單總價’ from ord

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