透视和连接 SQL 服务器中列的值

Question

我有 table 这些列：

ID | Name  | Value
------------------
 1 | Test1 | 0
 2 | Test2 | 1
 3 | Test3 | 0
 4 | Test4 | 0
 5 | Test5 | 1

我想将值列作为字符串进行旋转和连接

Answer 1

SELECT GROUP_CONCAT(Value SEPARATOR '') FROM Table

编辑：

无法在 SQL 服务器上工作。查看 Simulating group_concat MySQL function in Microsoft SQL Server 2005? 以尝试使其正常工作

Answer 2

下面的代码将给出预期的结果：

SELECT @Result = @Result + CAST(VALUE AS VARCHAR)
FROM #TmpTestingTable

或者您可以使用 STUFF:

SELECT STUFF(
    (   SELECT CAST(VALUE AS VARCHAR) 
        FROM #TmpTestingTable
        FOR XML PATH ('')
    ), 1, 0, '')

例如，我将列插入临时 table 并执行代码。

CREATE TABLE #TmpTestingTable (ID INT, Name VARCHAR (20), Value INT)

INSERT INTO #TmpTestingTable (ID, Name, Value) VALUES
(1 , 'Test1' , 0),
(2 , 'Test2' , 1),
(3 , 'Test3' , 0),
(4 , 'Test4' , 0),
(5 , 'Test5' , 1)

DECLARE @Result AS VARCHAR (100) = '';

-- using variable approach
SELECT @Result = @Result + CAST(VALUE AS VARCHAR)
FROM #TmpTestingTable

SELECT @Result

-- using STUFF approach
SELECT STUFF(
    (   SELECT CAST(VALUE AS VARCHAR) 
        FROM #TmpTestingTable
        FOR XML PATH ('')
    ), 1, 0, '')

DROP TABLE #TmpTestingTable

Answer 3

使用FOR XML连接。还包括一个 ORDER BY 很重要。否则，您无法控制值的顺序，并且会冒任意顺序的风险。

SELECT 
  (SELECT CAST([VALUE] AS CHAR(1)) 
   FROM yourtable
   ORDER BY ID
   FOR XML PATH ('')
  )

透视和连接 SQL 服务器中列的值

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