Mysql Count（*）as Total WHERE Total？

SELECT 
    Id, QId, UName, Ans, Date, COUNT(*) * 10 as Total 
FROM 
    question 
WHERE 
    COUNT(*) 
DESC 
GROUP BY 
    UName

2010-02-11 s3yfullah

where'COUNT（*）DESC' what？ – Quassnoi 2010-02-11 16:59:34

這個我沒有添加：S – s3yfullah 2010-02-11 22:14:21

我想你想過濾組使用HAVING COUNT(*)而不是WHERE：

SELECT Id, QId, UName, Ans, Date, Count(*) * 10 as Total 
FROM question 
GROUP BY UName 
HAVING Count(*)

如果你有什麼要由元素數量排序組，然後使用ORDER BY：

SELECT Id, QId, UName, Ans, Date, Count(*) * 10 as Total 
FROM question 
GROUP BY UName 
ORDER BY Count(*) DESC

2010-02-11 16:58:15

WHERE過濾器行，HAVING過濾器組 – 2010-02-11 17:00:29

@KM：感謝您的評論 – 2010-02-11 17:05:56

回答