SQL:“反向”转置表格 [英] SQL: "Reverse" transpose a table
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问题描述
下表显示了很多有关移置的问题...
I saw a lot of questions on transposing from the below table...
scanid | region | volume
-------------------------
1 A 34.4
1 B 32.1
1 C 29.1
2 A 32.4
2 B 33.2
2 C 35.6
to this table.
scanid | A_volume | B_volume | C_volume
----------------------------------------
1 34.4 32.1 29.1
2 32.4 33.2 35.6
但是,我需要做相反的事情,并且试图把我的头缠在这个问题上有麻烦。有人可以帮忙吗?
However, I need to do the inverse, and have trouble trying to wrap my head around this problem. Can anyone help?
谢谢。
推荐答案
您可以做到使用UNION子句非常简单:
You could do this very simply with a UNION clause:
Select Scan_ID, 'A' as Region, A_Volume as volume
union all
Select Scan_ID, 'B' as Region, B_Volume as volume
union all
Select Scan_ID, 'C' as Region, C_Volume as volume
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