废话不多说了,直接给大家贴代码了,具体代码如下所示:
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-- 开窗函数:在结果集的基础上进一步处理(聚合操作) -- Over函数,添加一个字段显示最大年龄 SELECT * , MAX (StuAge) OVER ( ) MaxStuAge FROM dbo.Student; -- Over函数,添加一个字段显示总人数 SELECT * , COUNT (StuID) OVER ( ) StuCount FROM dbo.Student; -- Partition By 分组统计数量 -- 根据性别分组后,统计 SELECT COUNT (*) OVER ( PARTITION BY StuSex ) , * FROM dbo.Student; -- 根据班级分组后,统计、排序 SELECT COUNT (*) OVER ( PARTITION BY Class ORDER BY Height) , * FROM dbo.Student; -- Over函数,添加一个字段显示平均身高 SELECT * , AVG (Height) OVER ( ) AgeHeight FROM dbo.Student; --Row_Rumber() SELECT ROW_NUMBER() OVER ( ORDER BY StuID DESC ) RowNumber , * FROM dbo.Student --Row_Rumber() 实现分页效果 ; WITH T AS ( SELECT ROW_NUMBER() OVER ( ORDER BY StuID DESC ) RowNumber , * FROM dbo.Student ) SELECT * FROM T WHERE T.RowNumber BETWEEN 1 AND 3; --Rank() 排名函数,名次相同,跳过 SELECT RANK() OVER ( ORDER BY Height ) , * FROM dbo.Student; --DENSE_Rank() 排名函数,名次相同不跳过 SELECT DENSE_RANK() OVER ( ORDER BY Height ) , * FROM dbo.Student; -- NTILE()函数,参数:记录总数/划分区域 = 每个区域数组,把记录序号放进数组 (平均分组) SELECT NTILE(3) OVER ( ORDER BY StuSex ) , * FROM dbo.Student; |
以上所述是小编给大家介绍的SQL Server 2012 开窗函数,希望对大家有所帮助,如果大家有任何疑问欢迎给我留言,小编会及时回复大家的!
原文链接:http://www.cnblogs.com/i-shanghai/p/6351346.html