将多行数据转换为1列

Question

我想从多列中创建一列。我在MSSQL中努力做到这一点。

ID     | Type1  | Type2
0      | Yellow | Blue
1      | Blue   | Yellow

我希望：

ID     | TYPE_ALL | TYPE
0      | Yellow   | Type1
0      | Blue     | Type2
1      | Blue     | Type1
1      | Yellow   | Type2

拜托，你知道怎么做吗？

谢谢。

Answer 1

这里可以使用UNPIVOT：

SELECT *
FROM Table
UNPIVOT
(Type_ALL FOR TYPE IN 
  (Type1, Type2)
)AS unpvt;

Answer 2

SELECT ID, Type1 AS TYPE_ALL, 'Type1' AS [TYPE] FROM YourTable 
UNION ALL
SELECT ID, Type2 AS TYPE_ALL, 'Type2' AS [TYPE] FROM YourTable

Answer 3

如果您不想UNPIVOT，则可以使用UNION查询：

SELECT ID,
       Type1 AS TYPE_ALL,
       'Type1' AS TYPE
FROM yourTable
UNION ALL
SELECT ID,
       Type2,
       'Type2'
FROM yourTable
ORDER BY ID