我需要旋转一列(数字列)。示例需要此数据:
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
看起来像这样
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...
我需要旋转一列(数字列)。示例需要此数据:
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
看起来像这样
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...
使用ROW_NUMBER()
,PIVOT
和一些动态 SQL(但不需要游标):
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)
这个相关问题应该有你需要的答案:SQL Server: Examples of PIVOTing String data
SSRS 中的矩阵控件具有动态列,如果此数据无论如何都绑定到报表,那么您可以使用它。否则,您将必须创建一个 sql sproc 来动态生成示例中的 sql,然后执行它。
只是因为我想获得更多的 CTE 经验,所以我想出了以下内容:
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,但它适用于您的示例
此处也可以使用合并函数,类似于关于连接数据的其他问题。
我不确定你正在做的事情在 SQL 中是否真的可能(或至少是实用的) - 我不确定,因为我仍然不确定你想要做什么。
您可以在客户端应用程序中构建该数据透视表,例如:
select distinct Letter from MyTable
获取字母列表,然后在循环内使用参数化查询:
select Number from MyTable where Letter=:letter
获取每个字母的数字列表。