MySQL获取所有分类和每个分类的前N条记录

发布时间：01/15 来源：浏览：关键词：

本文章给大家介绍MySQL获取所有分类和每个分类的前N条记录,Article(Id,Category,InsertDate)，现在要用SQL找出每种类型中时间最新的前N个数据组成的集合，一段不错的代码

代码如下

SELECT A1.*
FROM Article AS A1
     INNER JOIN (SELECT A.Category,A.InsertDate
                 FROM Article AS A
                      LEFT JOIN Article AS B
                        ON A.Category = B.Category
                           AND A.InsertDate <= B.InsertDate
                 GROUP BY A.Category,A.InsertDate
                 HAVING COUNT(B.InsertDate) <= @N
    ) AS B1
    ON A1.Category = B1.Category
       AND A1.InsertDate = B1.InsertDate
ORDER BY A1.Category,A1.InsertDate DESC

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