SQL Server 2012 中的无限追随是如何工作的？答案

【问题标题】：How the unbounded following works in SQL server 2012?SQL Server 2012 中的无限追随是如何工作的？
【发布时间】：2017-01-31 01:50:54
【问题描述】：

The Table "Cric_Team" looks like this

当我在 SQL Server 2012 中执行以下查询时，“无限跟随”并未计算该分区最后一行的总和。但是，根据定义，它应该从当前行计算到最后一行。

SELECT Cric_Id,Cric_First_Name,Cric_Last_Name,Cric_Role ,Runs,Centuries ,Fifty AS Fifties,Ducks,SUM(Ducks) OVER (PARTITION BY Cric_Role ORDER BY Ducks RANGE BETWEEN current row AND unbounded following) AS Total_Ducks FROM Cric_Team

The Screenshot of table after executing the query

【问题讨论】：

标签： sql sql-server-2012

【解决方案1】：

使用降序排序怎么样？做你想做的事吗？

SELECT Cric_Id, Cric_First_Name, Cric_Last_Name, Cric_Role, Runs,
       Centuries, Fifty AS Fifties, Ducks,
       SUM(Ducks) OVER ( PARTITION BY Cric_Role ORDER BY Ducks DESC) AS Total_Ducks  
FROM Cric_Team;

【讨论】：

不加'DESC'也按降序排列。不知道发生了什么。