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》
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
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
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
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)