sql 2005中的枢轴

Question

我需要旋转一列（Numbers列）。 例如需要这样的数据：

a 1 
a 2 
b 3 
b 4 
c 5 
d 6 
d 7 
d 8 
d 9 
e 10 
e 11 
e 12 
e 13 
e 14 

这个样子

a 1 2 
b 3 4 
c 5 
d 6 7 8 9 
e 10 11 12 13 14 

任何帮助，将不胜感激......

Answer 1

此相关的问题应该有你需要的答案：SQL Server: Examples of PIVOTing String data

SSRS中的Matrix控件具有动态列，如果无论如何都将此数据绑定到报表，那么您可以使用该列。否则，你将不得不创建一个sql sproc，动态地在exaamples中生成sql，然后执行它。

Answer 2

只是因为我想获得与CTE的一些经验，我想出了以下内容：

WITH CTE(CTEstring, CTEids, CTElast_id) 
AS 
(
    SELECT string, CAST(id AS VARCHAR(1000)), id 
    FROM dbo.Test_Pivot TP1 
    WHERE NOT EXISTS (SELECT * FROM dbo.Test_Pivot TP2 WHERE TP2.string = TP1.string AND TP2.id < TP1.id) 
    UNION ALL 
    SELECT CTEstring, CAST(CTEids + ' ' + CAST(TP.id AS VARCHAR) AS VARCHAR(1000)), TP.id 
    FROM dbo.Test_Pivot TP 
    INNER JOIN CTE ON 
     CTE.CTEstring = TP.string 
    WHERE 
     TP.id > CTE.CTElast_id AND 
     NOT EXISTS (SELECT * FROM dbo.Test_Pivot WHERE string = CTE.CTEstring AND id > CTE.CTElast_id AND id < TP.id) 
) 
SELECT 
    t1.CTEstring, t1.CTEids 
FROM CTE t1 
INNER JOIN (SELECT CTEstring, MAX(LEN(CTEids)) AS max_len_ids FROM CTE GROUP BY CTEstring) SQ ON SQ.CTEstring = t1.CTEstring AND SQ.max_len_ids = LEN(t1.CTEids) 
ORDER BY CTEstring 
GO 

它可能需要一些调整，但它与你的榜样

Answer 3

聚结功能，可以工作也可以在这里使用，类似于其他关于连接数据的问题。

How to create a SQL Server function to "join" multiple rows from a subquery into a single delimited field?

Answer 4

我不知道你在做什么是真的有可能（或至少实用）的SQL - 我不知道，因为我还不清楚自己想要什么做。

你可以建立一个数据透视表在您的客户端应用程序，例如有：

select distinct Letter from MyTable 

得到的字母列表，然后使用一个循环中参数化查询：

select Number from MyTable where Letter=:letter 

获取每封信的号码列表。

Answer 5

使用ROW_NUMBER()，PIVOT和一些动态SQL（但没有必要光标）：

CREATE TABLE [dbo].[stackoverflow_198716](
    [code] [varchar](1) NOT NULL, 
    [number] [int] NOT NULL 
) ON [PRIMARY] 

DECLARE @sql AS varchar(max) 
DECLARE @pivot_list AS varchar(max) -- Leave NULL for COALESCE technique 
DECLARE @select_list AS varchar(max) -- Leave NULL for COALESCE technique 

SELECT @pivot_list = COALESCE(@pivot_list + ', ', '') + '[' + CONVERT(varchar, PIVOT_CODE) + ']' 
     ,@select_list = COALESCE(@select_list + ', ', '') + '[' + CONVERT(varchar, PIVOT_CODE) + '] AS [col_' + CONVERT(varchar, PIVOT_CODE) + ']' 
FROM (
    SELECT DISTINCT PIVOT_CODE 
    FROM (
     SELECT code, number, ROW_NUMBER() OVER (PARTITION BY code ORDER BY number) AS PIVOT_CODE 
     FROM stackoverflow_198716 
    ) AS rows 
) AS PIVOT_CODES 

SET @sql = ' 
;WITH p AS (
    SELECT code, number, ROW_NUMBER() OVER (PARTITION BY code ORDER BY number) AS PIVOT_CODE 
    FROM stackoverflow_198716 
) 
SELECT code, ' + @select_list + ' 
FROM p 
PIVOT (
    MIN(number) 
    FOR PIVOT_CODE IN (
     ' + @pivot_list + ' 
    ) 
) AS pvt 
' 

PRINT @sql 

EXEC (@sql)