在 Sybase SQL 查询中进行透视?

Pivoting in Sybase SQL Query?(在 Sybase SQL 查询中进行透视?)

问题描述

我正在寻找一种方法来转换以下结果...

I am looking for a way to pivot the following results...

ID | Group_Level | Group_Values
1  | Division    | Value 1 
2  | Department  | Value 2
3  | Class       | Value 3

进入如下结构....

ID | Division | Department | Class
1  | Value 1  | Value 2    | Value 3    
2  | Value 1  | Value 2    | Value 3

列数是固定的(始终是部门/部门/类).该查询是为 Sybase 设计的……目前还无法弄清楚如何实现这种旋转.有什么建议吗?

The number of columns is fixed (it will always be division/department/class). The query is intended for Sybase... have been unable to figure out how to achieve this sort of pivoting yet. Any advice?

推荐答案

您需要一些键来定义 3 行的集合.然后，你自己加入

You need some key to define the set of 3 rows. Then, you just self JOIN

所以对于这样的数据...

So for data like this...

ID | GroupID | Group_Level | Group_Values
1  | 1 | Division    | Value 1
2  | 1 | Department  | Value 2
3  | 1 | Class       | Value 3
4  | 2 | Division    | Value 1
5  | 2 | Department  | Value 2
6  | 2 | Class       | Value 3

你应该有

SELECT
   Div.GroupID, Div.Group_Values, Dept.Group_Values, Cl.Group_Values
FROM
   MyTable Div
   JOIN
   MyTable Dept ON Div.GroupID = Dept.GroupID
   JOIN
   MyTable Cl ON Div.GroupID = Cl.GroupID
WHERE
   Div.Group_Level = 'Division'
   AND
   Dept.Group_Level = 'Department'
   AND
   Cl.Group_Level = 'Class'

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