前几天一直练习PIVOT透视,还实现了动态透视的存过程《动态透视表》https://www.cnblogs.com/insus/p/10888277.html
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:
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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
下面是Insus.NET实现UNPIVOT的代码:
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SELECT [Item] ,[Category] ,[Qty] FROM #Part_summary UNPIVOT ( [Qty] FOR [Category] IN ([B],[Q],[S],[T],[U]) ) AS [UNPIVOT TABLE] WHERE [Qty] > 0
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:
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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
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)
以下内容于2019-05-22 09:02:02.610更新:
先参考这篇《数据表列值转换为逗号分隔字符串》https://www.cnblogs.com/insus/p/10848578.html
对上面的存储过程[dbo].[usp_Dynamic_UnPivot]去掉一个参数,把这个参数移至存储过程内部进行。
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SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO -- ============================================= -- Author: Insus.NET -- Create date: 2019-05-20 -- Update date: 2019-05-22 -- 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 ) AS BEGIN IF OBJECT_ID('tempdb.dbo.#table_structure') IS NOT NULL DROP TABLE #table_structure CREATE TABLE #table_structure([name] SYSNAME) INSERT INTO #table_structure([name]) EXECUTE [dbo].[usp_Retrieve_Column_Name] 'tempdb','dbo',@table_name DELETE FROM #table_structure WHERE [name] = @common_column DECLARE @Comma_Delimited_Column_Names NVARCHAR(MAX) EXECUTE [dbo].[usp_TableColumnValueToCommaDelimitedString] '#table_structure','name',@Comma_Delimited_Column_Names OUTPUT DECLARE @sql AS NVARCHAR(MAX) = N' SELECT '+ @common_column +' ,'+ @unpivot_column +' ,'+ @sum_column +' 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
查看最后的例子,以前是手动指定动态列转为行的,现在已经不需要了。