在 Oracle 11g 中将列转换为行

Question

我有一个 table 这样的：

+----+----------+----------+----------+-----------+----------+----------+
| ID | AR_SCORE | ER_SCORE | FS_SCORE | CPF_SCORE | IF_SCORE | IS_SCORE |
+----+----------+----------+----------+-----------+----------+----------+
|  1 |       25 |       35 |       45 |        55 |       65 |       75 |
|  2 |       95 |       85 |       75 |        65 |       55 |       45 |
+----+----------+----------+----------+-----------+----------+----------+

我需要提取这个：

+----+----------+-------+
| ID |  SCORE   | VALUE |
+----+----------+-------+
|  1 | AR_SCORE |    25 |
|  1 | ER_SCORE |    35 |
|  2 | AR_SCORE |    95 |
+----+----------+-------+

我阅读了很多关于如何在 oracle 中使用数据透视表的问题，但我无法让它工作。

Answer 1

从列到行的转换实际上是一个UNPIVOT。由于您使用的是 Oracle 11g，因此您可以通过多种方式获得结果。

第一种方法是使用 SELECT yourcolumn FROM...UNION ALL:

的组合

select ID, 'AR_SCORE' as Score, AR_SCORE as value
from yourtable
union all
select ID, 'ER_SCORE' as Score, ER_SCORE as value
from yourtable
union all
select ID, 'FS_SCORE' as Score, FS_SCORE as value
from yourtable
union all
select ID, 'IF_SCORE' as Score, IF_SCORE as value
from yourtable
union all
select ID, 'IS_SCORE' as Score, IS_SCORE as value
from yourtable
order by id

查看 Demo. Using UNION ALL was how you needed to unpivot data prior to Oracle 11g, but starting in that version the UNPIVOT 功能已实现。这将以更少的代码行获得相同的结果：

select ID, Score, value
from yourtable
unpivot
(
  value
  for Score in (AR_SCORE, ER_SCORE, FS_SCORE, IF_SCORE, IS_SCORE)
) un
order by id

参见 Demo。两者都会给出一个结果：

| ID |    SCORE | VALUE |
|----|----------|-------|
|  1 | AR_SCORE |    25 |
|  1 | FS_SCORE |    45 |
|  1 | IS_SCORE |    75 |
|  1 | IF_SCORE |    65 |
|  1 | ER_SCORE |    35 |
|  2 | FS_SCORE |    75 |
|  2 | IS_SCORE |    45 |
|  2 | ER_SCORE |    85 |
|  2 | IF_SCORE |    55 |
|  2 | AR_SCORE |    95 |

在 Oracle 11g 中将列转换为行

Converting column to rows in Oracle 11g

oracle11g

unpivot