sqlserver 行转列

SELECT * FROM [TestRows2Columns]

--1：静态拼接行转列
SELECT [UserName],
SUM(CASE [Subject] WHEN '数学' THEN [Source] ELSE 0 END) AS '[数学]',
SUM(CASE [Subject] WHEN '英语' THEN [Source] ELSE 0 END) AS '[英语]',
SUM(CASE [Subject] WHEN '语文' THEN [Source] ELSE 0 END) AS '[语文]' ? ??
FROM [TestRows2Columns]
GROUP BY [UserName]
GO

--2：动态拼接行转列
DECLARE @sql VARCHAR(8000)
SET @sql = 'SELECT [UserName],' ??
SELECT @sql = @sql + 'SUM(CASE [Subject] WHEN '''+[Subject]+''' THEN [Source] ELSE 0 END) AS '''+QUOTENAME([Subject])+''',' ??
FROM (SELECT DISTINCT [Subject] FROM [TestRows2Columns]) AS a ? ??
SELECT @sql = LEFT(@sql,LEN(@sql)-1) + ' FROM [TestRows2Columns] GROUP BY [UserName]' ??
PRINT(@sql)
EXEC(@sql)
GO

--3：静态PIVOT行转列
SELECT ?*
FROM ? ?( SELECT ? ?[UserName],
? ? ? ? ? ? ? ? ? ? [Subject],
? ? ? ? ? ? ? ? ? ? [Source]
? ? ? ? ? FROM ? ? ?[TestRows2Columns]
? ? ? ? ) p PIVOT
( SUM([Source]) FOR [Subject] IN ( [数学],[英语],[语文] ) ) AS pvt
ORDER BY pvt.[UserName];
GO

--4：动态PIVOT行转列
DECLARE @sql_str VARCHAR(8000)
DECLARE @sql_col VARCHAR(8000)
SELECT @sql_col = ISNULL(@sql_col + ',','') + QUOTENAME([Subject]) FROM [TestRows2Columns] GROUP BY [Subject]
SET @sql_str = '
SELECT * FROM (
? ? SELECT [UserName],[Source] FROM [TestRows2Columns]) p PIVOT?
? ? (SUM([Source]) FOR [Subject] IN ( '+ @sql_col +') ) AS pvt?
ORDER BY pvt.[UserName]'
PRINT (@sql_str)
EXEC (@sql_str)

--5：参数化动态PIVOT行转列
-- =============================================
-- Author: ? ? ? ?<听风吹雨>
-- Create date: <2014.05.26>
-- Description: ? ?<参数化动态PIVOT行转列>
-- Blog: ? ? ? ?<http://www.cnblogs.com/gaizai/>
-- =============================================
DECLARE @sql_str NVARCHAR(MAX)
DECLARE @sql_col NVARCHAR(MAX)
DECLARE @tableName SYSNAME --行转列表
DECLARE @groupColumn SYSNAME --分组字段
DECLARE @row2column SYSNAME --行变列的字段
DECLARE @row2columnValue SYSNAME --行变列值的字段
SET @tableName = 'TestRows2Columns'
SET @groupColumn = 'UserName'
SET @row2column = 'Subject'
SET @row2columnValue = 'Source'


--从行数据中获取可能存在的列
SET @sql_str = N'
SELECT @sql_col_out = ISNULL(@sql_col_out + '','','''') + QUOTENAME(['+@row2column+'])?
? ? FROM ['+@tableName+'] GROUP BY ['+@row2column+']'
--PRINT @sql_str
EXEC sp_executesql @sql_str,N'@sql_col_out NVARCHAR(MAX) OUTPUT',@sql_col_out=@sql_col OUTPUT
--PRINT @sql_col


SET @sql_str = N'
SELECT * FROM (
? ? SELECT ['+@groupColumn+'],['+@row2column+'],['+@row2columnValue+'] FROM ['+@tableName+']) p PIVOT?
? ? (SUM(['+@row2columnValue+']) FOR ['+@row2column+'] IN ( '+ @sql_col +') ) AS pvt?
ORDER BY pvt.['+@groupColumn+']'
--PRINT (@sql_str)
EXEC (@sql_str)

--6：带条件查询的参数化动态PIVOT行转列
-- =============================================
-- Author: ? ? ? ?<听风吹雨>
-- Create date: <2014.05.26>
-- Description: ? ?<参数化动态PIVOT行转列，带条件查询的参数化动态PIVOT行转列>
-- Blog: ? ? ? ?<http://www.cnblogs.com/gaizai/>
-- =============================================
DECLARE @sql_str NVARCHAR(MAX)
DECLARE @sql_col NVARCHAR(MAX)
DECLARE @sql_where NVARCHAR(MAX)
DECLARE @tableName SYSNAME --行转列表
DECLARE @groupColumn SYSNAME --分组字段
DECLARE @row2column SYSNAME --行变列的字段
DECLARE @row2columnValue SYSNAME --行变列值的字段
SET @tableName = 'TestRows2Columns'
SET @groupColumn = 'UserName'
SET @row2column = 'Subject'
SET @row2columnValue = 'Source'
SET @sql_where = 'WHERE UserName = ''王五'''


--从行数据中获取可能存在的列
SET @sql_str = N'
SELECT @sql_col_out = ISNULL(@sql_col_out + '','''') + QUOTENAME(['+@row2column+'])?
? ? FROM ['+@tableName+'] '+@sql_where+' GROUP BY ['+@row2column+']'
--PRINT @sql_str
EXEC sp_executesql @sql_str,['+@row2columnValue+'] FROM ['+@tableName+']'+@sql_where+') p PIVOT?
? ? (SUM(['+@row2columnValue+']) FOR ['+@row2column+'] IN ( '+ @sql_col +') ) AS pvt?
ORDER BY pvt.['+@groupColumn+']'
--PRINT (@sql_str)
EXEC (@sql_str)

http://www.cnblogs.com/gaizai/p/3753296.html

（编辑：李大同）

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