问题
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:
ID DATE TEST_1 TEST_2 TEST_3
----------------------------------------
1 1jan12 98 66 77
2 2jan12 75 89 72
Into:
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!
回答1:
One option would be to use '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
来源：https://stackoverflow.com/questions/17060044/how-to-transpose-a-table-from-columns-to-rows-in-oracle-sql