使用输出参数将动态行转换为列？

Question

我可以在查询中显示统计列，例如第1列，第2列，第3列....等等。

但我想这样做是动态的。

我的数据如下：

我希望能够执行存储过程来获取输出结果： 执行sp_output 1 （从另一个窗口，其中'1'代表PoolID（@AppPool）），如下所示：

这是我的SP：

create PROCEDURE [dbo].[sp_test]
@Query as nvarchar(100) -- OUTPUT?, 
@AppPool AS nvarchar(50) 
AS

SELECT @Query = Attribute  FROM [dbo].[Vy_UserAccess] WHERE PoolID = @AppPool

SELECT [Users],'+ @Query +' FROM
(SELECT [Pool],[Users],[RecNum],[Attribute],[Values] FROM [dbo].[Vy_UserAccess] ) AS  T1
PIVOT (MAX([Values]) FOR [ATTRIBUTE] IN ('+ @Query +')) AS T2

这可以通过微调我的代码来实现，还是我必须转向另一个方向？

Answer 1

你可以在下面这样做：

<强> QUERY

CREATE PROCEDURE [dbo].[sp_test]
@AppPool AS NVARCHAR(60)
AS
DECLARE @cols   AS NVARCHAR(MAX) = '',
        @sql    AS NVARCHAR(MAX)

SELECT @cols += QUOTENAME([Name]) + ','
FROM   (SELECT DISTINCT Attribute as Name
        FROM    [dbo].[Vy_UserAccess]
        WHERE   PoolID = @AppPool
        ) a 
ORDER BY Name DESC 

SET @cols   = LEFT(@cols, LEN(@cols) - 1)   

SET @sql    = 'SELECT Users, ' + @cols + ' FROM 
    (
    SELECT [Pool],[Users],[RecNum],[Attribute],[Values] 
    FROM [dbo].[Vy_UserAccess]
     ) AS  T1
PIVOT (MAX([Values]) FOR [ATTRIBUTE] IN ('+ @cols +')) AS T2'

EXEC sp_executesql @sql, N'@AppPool NVARCHAR(60)', @AppPool

<强> EXECUTION

Exec sp_test 1

查询样本数据

CREATE PROCEDURE sp_test 
@AppPool AS NVARCHAR(60)
AS

CREATE TABLE #test
(
    PoolId NVARCHAR(60),
    Pool NVARCHAR(40),
    Users NVARCHAR(60),
    RecNum INT,
    Attribute NVARCHAR(40),
    [Values] NVARCHAR(20)
)
INSERT INTO #test VALUES
('1', 'FINANCE', 'User1', 2, 'DIVISION', '010'),
('1', 'FINANCE', 'User1', 1, 'COMPANY',  '1'),
('1', 'FINANCE', 'User1', 1, 'DIVISION', '050')



DECLARE @cols   AS NVARCHAR(MAX) = '',
        @sql    AS NVARCHAR(MAX)

SELECT @cols += QUOTENAME([Name]) + ','
FROM   (SELECT DISTINCT Attribute as Name
        FROM    #test
        WHERE   PoolID = @AppPool       
        ) a 
ORDER BY Name DESC                      
SET @cols   = LEFT(@cols, LEN(@cols) - 1)


SET @sql    = 'SELECT Users, ' + @cols + ' FROM 
    (
    SELECT [Pool],[Users],[RecNum],[Attribute],[Values] 
    FROM #test
     ) AS  T1
PIVOT (MAX([Values]) FOR [ATTRIBUTE] IN ('+ @cols +')) AS T2'

EXEC Sp_executesql @sql, N'@AppPool NVARCHAR(60)', @AppPool

DROP TABLE #test

<强>输出

Users   DIVISION    COMPANY
User1   050         1
User1   010         NULL