我学习的是MySQL,学习写sql语句过程中遇到Group By 和 Union。
大家乐意看这两个链接,写的很好
Group By: www.cnblogs.com/rainman/archive/2013/05/01/3053703.html
Union : http://www.jb51.net/article/489...
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I hope you know the beautiful Union-Find structure. In this problem, you’re to implement something similar, but not identical. The data structure you need to write is also ...
select *from ( select top (@count1) a.* from article as a with (nolock)left join article_type as at with (nolock)on a.articletype=at.articletypeidwhere a.isdelete=0 and a.status=0and at.articlet...