mysql 查詢練習——計算總訂單價格大於100的訂單號和總訂單價格

問題：查詢總訂單價格大於100的訂單號和總訂單價格，SQL語句如下： 答案：SELECT o_num,  SUM(quantity *item_price) AS orderTotal FROM orderitems GROUP BY o_num HAVING SUM(quantity*item_price) >= 100;

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