MySQL 获取所有分类和每个分类的前几条记录
SELECT A1.*FROM Article AS A1INNER JOIN (SELECT A.Category,A.InsertDateFROM Article AS ALEFT JOIN Article AS BON A.Category = B.CategoryAND A.InsertDate <= B.InsertDateGROUP BY A.Category,A.InsertDateHAVING COUNT(B.InsertDate) <= @N) AS B1ON A1.Category = B1.CategoryAND A1.InsertDate = B1.InsertDateORDER BY A1.Category,A1.InsertDate DESC

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ps: ?@N 就是要取多少条