MySQL获取所有分类和每个分类的前N条记录

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

复制代码

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                  GROUP BY A.Category,A.InsertDate                  HAVING COUNT(B.InsertDate)     ) AS B1      ON A1.Category = B1.Category         AND A1.InsertDate = B1.InsertDate ORDER BY A1.Category,A1.InsertDate DESC