今天练习MS SQL Server逆透视的功能。
首先准备一些可以逆透视的数据：
IF OBJECT_ID(‘tempdb.dbo.#Part_summary’) IS NOT NULL DROP TABLE #Part_summary
CREATE TABLE #Part_summary (
[Item] NVARCHAR(40),
[B]DECIMAL(18,2),
[Q]DECIMAL(18,2),
[S]DECIMAL(18,2),
[T]DECIMAL(18,2),
[U]DECIMAL(18,2)
)
INSERT INTO #Part_summary ([Item],[B],[Q],[S],[T],[U])
VALUES (‘098-SSSS1-WS0098-5526’,0,0,500.00,0,0),
(’54F-ART43-6545NN-2514′,0,0,934.39,0,0),
(‘872-RTDE3-Q459PW-2323’,0,0,0,452.44,0),
(‘B78-F1H2Y-5456UD-2530’,0,0,0,115.06,0),
(‘I32-GG443-QT0098-0001’,0,0,423.65,0,0),
(‘I38-AA321-WS0098-0506’,470.87,0,0,0,0),
(‘K38-12321-5456UD-3493’,200.28,0,0,0,0),
(‘PO0-7G7G7-JJY098-0077’,0,871.33,0,0,0),
(‘RVC-43ASE-H43QWW-9753’,0,0,0,0,555.19),
(‘X3C-SDEWE-3ER808-8764’,0,607.88,0,0,0)
SELECT [Item],[B],[Q],[S],[T],[U] FROM #Part_summary
Source Code
下面是Insus.NET实现UNPIVOT的代码：
SELECT [Item]
,[Category]
,[Qty]
FROM #Part_summary
UNPIVOT (
[Qty] FOR [Category]
IN ([B],[Q],[S],[T],[U])
) AS [UNPIVOT TABLE]
WHERE [Qty] > 0
Source Code
以上是以手动实现逆透视。如果想实现动态逆透视。可以参考下面的存储过程：
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
— =============================================
— Author: Insus.NET
— Create date: 2019-05-20
— Update date: 2019-05-20
— Description: 动态逆透视
CREATE PROCEDURE [dbo].[usp_Dynamic_UnPivot]
(
@table_name SYSNAME, –透视的表名
@common_column SYSNAME, –常规共用列名
@unpivot_column SYSNAME, –逆透视列名
@sum_column SYSNAME, –计和的列名
@Comma_Delimited_Column_Names NVARCHAR(MAX)
)
AS
BEGIN
DECLARE @sql AS NVARCHAR(MAX) = N’
SELECT ‘+ @common_column +’
,’+ @unpivot_column +’
,[Qty]
FROM ‘+ @table_name +’
UNPIVOT (
‘+ @sum_column +’ FOR ‘+ @unpivot_column +’
IN (‘+ @Comma_Delimited_Column_Names +’)
) AS [UNPIVOT TABLE]
WHERE ‘+ @sum_column +’ > 0′
EXECUTE sp_executeSql @sql
END
GO
Source Code
怎样使用这个存储过程呢，参考下面参数传入方法：
重复一下，存储过程的参数说明如下：
@table_name SYSNAME, –透视的表名
@common_column SYSNAME, –常规共用列名
@unpivot_column SYSNAME, –逆透视列名
@sum_column SYSNAME, –计和的列名
@Comma_Delimited_Column_Names NVARCHAR(MAX)
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