我有一个表 StudentMarks
,其中包含 Name、Maths、Science、English
列.数据就像
I have a table StudentMarks
with columns Name, Maths, Science, English
.
Data is like
Name, Maths, Science, English
Tilak, 90, 40, 60
Raj, 30, 20, 10
我想按如下方式安排:
Name, Subject, Marks
Tilak, Maths, 90
Tilak, Science, 40
Tilak, English, 60
使用 unpivot 我是能够正确获取Name、Marks,但无法将源表中的列名获取到所需结果集中的Subject
列.
With unpivot I am able to get Name, Marks properly, but not able to get the column name in the source table to the Subject
column in the desired result set.
我怎样才能做到这一点?
How can I achieve this?
到目前为止,我已经完成了以下查询(以获取名称、标记)
I have so far reached the following query (to get Name, Marks)
select Name, Marks from studentmarks
Unpivot
(
Marks for details in (Maths, Science, English)
) as UnPvt
您的查询非常接近.您应该能够使用以下内容,其中包括最终选择列表中的 subject
:
Your query is very close. You should be able to use the following which includes the subject
in the final select list:
select u.name, u.subject, u.marks
from student s
unpivot
(
marks
for subject in (Maths, Science, English)
) u;
参见SQL Fiddle with demo
这篇关于使用列名逆透视的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!