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GROUP BY在SQL查询语句中的使用
阅读量:372 次
发布时间:2019-03-04

本文共 859 字,大约阅读时间需要 2 分钟。

表content

"ID" "title" "content" "User_ID" "Type_ID" "Hits" "time" "tag"

 

表type

"ID" "typeName"

 

表users

"ID" "UserName"

 

 

SQL查询语句实现“按某类统计按文章数量给用户排名”

SELECT UserName, aa.ContentCount

FROM [SELECT content.User_ID, Count(content.User_ID) AS ContentCount
FROM content, type
WHERE (((type.ID)=1) AND ((content.Type_ID)=[type].[id]))
GROUP BY content.User_ID
ORDER BY Count(content.User_ID) DESC]. AS aa, Users
WHERE Users.id=aa.User_ID;

 

SQL查询语句实现“统计按文章数量给用户排名”

SELECT UserName, aa.ContentCount

FROM [SELECT content.User_ID, Count(content.User_ID) AS ContentCount
FROM content, type
WHERE (content.Type_ID)=[type].[id]
GROUP BY content.User_ID
ORDER BY Count(content.User_ID) DESC]. AS aa, Users
WHERE Users.id=aa.User_ID;

 

SQL查询语句实现“按用户统计文章点击率排名”

SELECT Sum(content.Hits) AS Hits之总计, content.User_ID

FROM content
GROUP BY content.User_ID
ORDER BY Sum(content.Hits) DESC;

 

 

 

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