GROUP BY在SQL查询语句中的使用-白红宇

GROUP BY在SQL查询语句中的使用

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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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