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題解 | #糾錯3#

糾錯3

http://www.fangfengwang8.cn/practice/3870c9bca7a4406f899af3e903b8bf51

SELECT order_num, COUNT(*) AS items 
FROM OrderItems 
GROUP BY order_num 
HAVING items >= 3 
ORDER BY items, order_num;

1.group by中必須包含select語句中的非聚合函數(shù)

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