10

我有一个查询，我正在尝试将行值转换为列名，目前我正在使用SUM(Case...) As 'ColumnName'语句，如下所示：

SELECT
SKU1,
SUM(Case When Sku2=157 Then Quantity Else 0 End) As '157',
SUM(Case When Sku2=158 Then Quantity Else 0 End) As '158',
SUM(Case When Sku2=167 Then Quantity Else 0 End) As '167'
FROM
OrderDetailDeliveryReview
Group By
OrderShipToID,
DeliveryDate,
SKU1

上面的查询效果很好，给了我我需要的东西。但是，我SUM(Case...根据以下查询的结果手动写出语句：

Select Distinct Sku2 From OrderDetailDeliveryReview

有没有办法在存储过程中使用 T-SQL，我可以SUM(Case...从Select Distinct Sku2 From OrderDetailDeliveryReview查询中动态生成语句，然后执行生成的 SQL 代码？

4

4 回答 4

12

多年来，通过从元数据生成动态数据透视 SQL 已经回答了很多这些问题，请查看以下示例：

SQL Dynamic Pivot - 如何对列进行排序

SQL Server 2005 以未知列数为中心

哪些 SQL 查询或视图将显示“动态列”

如何在 T-SQL 中透视 XML 列的属性

如何将 DRY 原则应用于枢轴月份的 SQL 语句

在您的特定情况下（使用 ANSI Pivot 而不是 SQL Server 2005 的 PIVOT 功能）：

DECLARE @template AS varchar(max)
SET @template = 'SELECT 
SKU1
{COLUMN_LIST}
FROM
OrderDetailDeliveryReview
Group By
OrderShipToID,
DeliveryDate,
SKU1
'

DECLARE @column_list AS varchar(max)
SELECT @column_list = COALESCE(@column_list, ',') + 'SUM(Case When Sku2=' + CONVERT(varchar, Sku2) + ' Then Quantity Else 0 End) As [' + CONVERT(varchar, Sku2) + '],' 
FROM OrderDetailDeliveryReview
GROUP BY Sku2
ORDER BY Sku2

Set @column_list = Left(@column_list,Len(@column_list)-1)

SET @template = REPLACE(@template, '{COLUMN_LIST}', @column_list)

EXEC (@template)
于 2010-03-31T17:32:02.163 回答
2

我知道 SO 搜索引擎并不完美，但您的问题已在SQL Server PIVOT Column Data中得到解答。
另请参阅在 SQL 中创建交叉表查询和数据透视表。

于 2010-03-31T17:03:30.787 回答
1

当您可以从任何表中动态提取所有这些内容时，为什么要使用硬编码的列名呢？

使用 UNPIVOT 和 COALESCE，我可以动态地从任何表中提取列列表以及记录列表中任何记录的关联列值，并将它们组合到列名列表中，并按行列出值。这是代码。只需输入您的数据库和表名。将在 SQL Server 中为您生成列/值表。请记住，要为要转换为 sql 变体或文本字符串的列获取共享值列。但是，使用我们的 while 循环或游标获取具有匹配列名称和类型的值的示例列列表的好方法。它非常快：

-- First get a list of all known columns in your database, dynamically...
DECLARE @COLUMNS nvarchar(max)
SELECT @COLUMNS = 

CASE
 WHEN A.DATA_TYPE = 'nvarchar' OR A.DATA_TYPE = 'ntext' THEN 
COALESCE(@COLUMNS + ',','') + 'CAST(CONVERT(nvarchar(4000),['+A.[name]+']) AS sql_variant) AS ['+A.[name]+']'
 WHEN A.DATA_TYPE = 'datetime' OR A.DATA_TYPE = 'smalldatetime' THEN 
COALESCE(@COLUMNS + ',','') + 'CAST(CONVERT(nvarchar,['+A.[name]+'],101) AS sql_variant) AS ['+A.[name]+']'
 ELSE
 COALESCE(@COLUMNS + ',','') + 'CAST(['+A.[name]+'] AS sql_variant) AS ['+A.[name]+']'
 END

FROM
(
 SELECT
 A.name,
 C.DATA_TYPE
 FROM YOURDATABASENAME.dbo.syscolumns A
 INNER JOIN YOURDATABASENAME.dbo.sysobjects B ON B.id = A.id
 LEFT JOIN
 (
 SELECT 
COLUMN_NAME,
 DATA_TYPE
 FROM YOURDATABASENAME.INFORMATION_SCHEMA.COLUMNS 
WHERE TABLE_NAME = 'YOURTABLENAME' 
) C ON C.COLUMN_NAME = A.name
 WHERE B.name = 'YOURTABLENAME'
 AND C.DATA_TYPE <> 'timestamp' 
) A
-- Test that the formatted columns list is returned...
--SELECT @COLUMNS

-- This gets a second string list of all known columns in your database, dynamically...
DECLARE @COLUMNS2 nvarchar(max)
SELECT @COLUMNS2 = COALESCE(@COLUMNS2 + ',','') + '['+A.[name]+']'
FROM
(
 SELECT
 A.name,
 C.DATA_TYPE
 FROM YOURDATABASENAME.dbo.syscolumns A
 INNER JOIN YOURDATABASENAME.dbo.sysobjects B ON B.id = A.id
 LEFT JOIN
 (
 SELECT 
COLUMN_NAME,
 DATA_TYPE
 FROM YOURDATABASENAME.INFORMATION_SCHEMA.COLUMNS 
WHERE TABLE_NAME = 'YOURTABLENAME' 
) C ON C.COLUMN_NAME = A.name
 WHERE B.name = 'YOURTABLENAME'
 AND C.DATA_TYPE <> 'timestamp' 
) A
-- Test that the formatted columns list is returned...
--SELECT @COLUMNS2


-- Now plug in the list of the dynamic columns list into an UNPIVOT to get a Column Name / Column Value list table...
DECLARE @sql nvarchar(max)
SET @sql = 
'
SELECT
ColumnName,ColumnValue
FROM
(
SELECT
'+@COLUMNS+'
FROM YOURDATABASENAME.dbo.YOURTABLENAME  
WHERE CHANGE_ID IN (SELECT ChangeId FROM YOURDATABASENAME.dbo.OperatorProcess WHERE OperatorProcessID = 3)
) AS SourceTable
UNPIVOT
(
ColumnValue FOR ColumnName IN ('+@COLUMNS2+')
) AS PivotTable
'

EXEC (@sql)
于 2012-05-17T20:01:52.897 回答
0 
-- Darshankar Madhusudan i can do dynamic columnheading table easly...
--thanks  
declare @incr int = 1,
        @col  int,
        @str varchar(max),
        @tblcrt varchar(max),
        @insrt varchar(max),
        set @tblcrt = 'DECLARE @Results table ('        
        set @str = ''      
        set @insrt = ''  
    select @col = max(column_id) From tempdb.sys.all_columns    where object_id = object_id('tempdb.dbo.#aaa')
    while @incr <= @col
        BEGIN
             SELECT @STR = @STR    +case when @incr = 1 then '''' else ',''' end +rtrim(ltrim(NAME))+'''' FROM TEMPDB.SYS.ALL_COLUMNS    WHERE OBJECT_ID = OBJECT_ID('TEMPDB.DBO.#AAA') and column_id = @incr 
             set @tblcrt = @tblcrt + case when @incr = 1 then '' else ',' end + 'Fld'+CAST(@incr as varchar(3)) +' varchar(50)'
             set @insrt = @insrt   + case when @incr = 1 then '' else ',' end + 'Fld'+CAST(@incr as varchar(3))
             SET @INCR = @INCR + 1 
        END 
        set @tblcrt = @tblcrt + ')'
        set @insrt = 'insert into @Results('+@insrt+') values (' + @STR +')'
        set @tblcrt = @tblcrt+ ';' + @insrt + 'select * from @Results '
exec(@tblcrt)
于 2016-01-08T07:43:43.637 回答