如何在 Oracle sql 中将表从列转换为行
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How to transpose a table from columns to rows in Oracle sql
提问by AYR
I have a table in sql which has a number of columns with the same type of data each column. I would like to transpose the table's columns into rows so that all of the data appears in 1 column. An example of the type of table I am talking about:
我在 sql 中有一个表，它有许多列，每列的数据类型相同。我想将表的列转换为行，以便所有数据都出现在 1 列中。我正在谈论的表格类型的一个例子：
ID DATE TEST_1 TEST_2 TEST_3
----------------------------------------
1 1jan12 98 66 77
2 2jan12 75 89 72
Into:
进入：
ID DATE TEST SCORE
-----------------------------------
1 1jan12 TEST_1 98
1 1jan12 TEST_2 66
1 1jan12 TEST_3 77
2 2jan12 TEST_1 75
2 2jan12 TEST_2 89
2 2jan12 TEST_3 72
Thanks in advance for any suggestions or directions!
在此先感谢您的任何建议或指示！
回答by Sam
One option would be to use 'Union All':
一种选择是使用“Union All”：
SELECT ID, DATE, 'TEST_1' AS TEST, TEST_1 AS SCORE
FROM TABLE
UNION ALL
SELECT ID, DATE, 'TEST_2' AS TEST, TEST_2 AS SCORE
FROM TABLE
UNION ALL
SELECT ID, DATE, 'TEST_3' AS TEST, TEST_3 AS SCORE
FROM TABLE
