Question

我有一个包含两列的表格，如下所示：

等

我想将它们放到一列中，每列的数据都在新列的备用行中，如下所示：

A
1
B
2
C
3
D
4
E
5

等

Answer 1

我会使用UNION ALL，但这里是UNPIVOT替代方案：

CREATE TABLE #Table1(letter VARCHAR(10),Id VARCHAR(10))

INSERT INTO #Table1(letter ,Id )
SELECT 'A',1 UNION ALL
SELECT 'B',2 UNION ALL
SELECT 'C',3 UNION ALL
SELECT 'D',4 UNION ALL
SELECT 'E',5 


SELECT [value]
FROM #Table1
UNPIVOT
(
    [value] FOR [Column] IN ([Id], [letter])
) UNPVT


DROP TABLE #Table1;

Answer 2

CREATE TABLE #Table1(Value VARCHAR(10),Id VARCHAR(10))

INSERT INTO #Table1(Value ,Id )
SELECT 'A',1 UNION ALL
SELECT 'B',2 UNION ALL
SELECT 'C',3 UNION ALL
SELECT 'D',4 UNION ALL
SELECT 'E',5 

;WITH _CTE (Name) AS
(
 SELECT Value [Name]
 FROM #Table1
 UNION ALL
 SELECT Id [Name]
 FROM #Table1
)
SELECT * FROM _CTE

Answer 3

棘手的部分是备用行中的数据

select col2 
from 
 ( select col1, 1 as flag, col1 from tab
   union all
   select col1, 2,         col2 from tab
 ) as dt
order by col1, flag

但你为什么要尝试这样做呢？

Answer 4

试试这个：

WITH CTE AS
(
  SELECT Col1Name Name,(ROW_NUMBER() OVER(ORDER BY(SELECT NULL))) RN 
  FROM TableName
  UNION 
  SELECT Col2Name Name,(ROW_NUMBER() OVER(ORDER BY(SELECT NULL)))+1 RN 
  FROM TableName
)
SELECT Name
FROM CTE
ORDER BY RN

使用备用行将两列合二为一

4 个答案: