本文介绍了在 Sybase SQL 查询中进行透视?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
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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