在SQL Server中创建关联矩阵
我试图在SQL Server中获取相关矩阵,我的数据以以下方式显示在表中:在SQL Server中创建关联矩阵,sql,sql-server,tsql,Sql,Sql Server,Tsql,我试图在SQL Server中获取相关矩阵,我的数据以以下方式显示在表中: RptLOB1 RptLOB2 Correlation AE AE 1 Bail AE 0.35 Commercial Bail 0.25 Commercial AE 0.15 AE Bail Commercial AE 1
RptLOB1 RptLOB2 Correlation
AE AE 1
Bail AE 0.35
Commercial Bail 0.25
Commercial AE 0.15
AE Bail Commercial
AE 1 0.35 0.15
Bail 0.35 1 0.25
Commercial 0.15 0.25 1
……等等
我想写一段代码,以便我的输出如下所示:
RptLOB1 RptLOB2 Correlation
AE AE 1
Bail AE 0.35
Commercial Bail 0.25
Commercial AE 0.15
AE Bail Commercial
AE 1 0.35 0.15
Bail 0.35 1 0.25
Commercial 0.15 0.25 1
RptLOB的顺序并不重要,只要从上到下和从左到右的顺序相同。我一直在试图找到一种方法来解决这个问题,但我不太确定最好的方法是什么。我曾考虑使用PIVOT,但它不会在顶部输出RptLOB(它们将被视为表中的列)
编辑:
此输出将插入另一个表中,如下所示:
col1 col2 col3 col4 col5
Generic
Company Inputs Insurance Stochastic Model Correlations Exposure Correlation Matrix
AE Bail Commercial
AE 1 0.35 0.15
Bail 0.35 1 0.25
Commercial 0.15 0.25 1
问题是您的数据不够完整。因此,根据您的需要对其进行增强:
with d as (
select RptLOB1, RptLOB2, Correlation from t union all
select RptLOB2, RptLOB1, Correlation from t union all
select distinct RptLob1, RptLob1, 1.0 from t
)
select RptLOB1, RptLOB2, Corr
from d
pivot (max(correlation) for val in ('AE', 'Bail', 'Commercial')) as corr
如果您不知道所有值的名称,那么对于一般情况,您需要使用动态SQL。您可以使用
透视。如果知道必须转换的列数,则可以使用静态版本:
select *
from
(
select RptLOB1 RptLOB1, RPTLOB2 RPTLOB2, Correlation
from yourtable
union all
select RPTLOB2, RptLOB1, Correlation
from yourtable
union all
select distinct RptLOB1, RptLOB1, 1.0
from yourtable
) x
pivot
(
max(Correlation)
for RPTLOB2 in ([AE], [Bail], [Commercial])
) p;
DECLARE @query AS NVARCHAR(MAX),
@colsPivot as NVARCHAR(MAX)
select @colsPivot = STUFF((SELECT distinct ','
+ quotename(RptLOB1)
from yourtable t
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set @query
= 'select RptLOB1, '+@colspivot+ '
from
(
select RptLOB1 RptLOB1, RPTLOB2 RPTLOB2, Correlation
from yourtable
union all
select RPTLOB2, RptLOB1, Correlation
from yourtable
union all
select distinct RptLOB1, RptLOB1, 1.0
from yourtable
) x
pivot
(
max(Correlation)
for RPTLOB2 in ('+ @colspivot +')
) p'
exec(@query)
看见
如果要关联的值数目未知,则需要使用动态版本:
select *
from
(
select RptLOB1 RptLOB1, RPTLOB2 RPTLOB2, Correlation
from yourtable
union all
select RPTLOB2, RptLOB1, Correlation
from yourtable
union all
select distinct RptLOB1, RptLOB1, 1.0
from yourtable
) x
pivot
(
max(Correlation)
for RPTLOB2 in ([AE], [Bail], [Commercial])
) p;
DECLARE @query AS NVARCHAR(MAX),
@colsPivot as NVARCHAR(MAX)
select @colsPivot = STUFF((SELECT distinct ','
+ quotename(RptLOB1)
from yourtable t
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set @query
= 'select RptLOB1, '+@colspivot+ '
from
(
select RptLOB1 RptLOB1, RPTLOB2 RPTLOB2, Correlation
from yourtable
union all
select RPTLOB2, RptLOB1, Correlation
from yourtable
union all
select distinct RptLOB1, RptLOB1, 1.0
from yourtable
) x
pivot
(
max(Correlation)
for RPTLOB2 in ('+ @colspivot +')
) p'
exec(@query)
看见
编辑-根据您的注释,如果希望列标题位于另一行中,则可以使用以下选项:
DECLARE @query AS NVARCHAR(MAX),
@colsPivot as NVARCHAR(MAX),
@colsRow as NVARCHAR(MAX),
@colsConverted as NVARCHAR(MAX)
select @colsPivot = STUFF((SELECT distinct ','
+ quotename(RptLOB1)
from yourtable t
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
select @colsRow = STUFF((SELECT distinct ', '''
+ RptLOB1 + ''' as ' + RptLOB1
from yourtable t
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
select @colsConverted
= STUFF((SELECT distinct ', CAST('
+ quotename(RptLOB1)
+ ' as varchar(50))'
from yourtable t
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set @query
= 'select ''RptLOB1'' as RptLOB1,
'+ @colsRow + '
union all
select RptLOB1, '+ @colsConverted+ '
from
(
select RptLOB1 RptLOB1, RPTLOB2 RPTLOB2, Correlation
from yourtable
union all
select RPTLOB2, RptLOB1, Correlation
from yourtable
union all
select distinct RptLOB1, RptLOB1, 1.0
from yourtable
) x
pivot
(
max(Correlation)
for RPTLOB2 in ('+ @colspivot +')
) p'
exec(@query)
请看@OMGPonies我能想到的唯一一件事就是旋转行值来创建顶行,但如果我这样做,行值就会变成列标题,这不是我想要的。我不确定如何处理,这样就不会发生这种情况,我可以创建矩阵……我认为使用纯SQL将非常困难。我建议尝试其他工具,比如R编程语言。如果您不希望列成为列标题,那么您会遇到数据类型不匹配的问题。使用R编程没什么大不了的,但我需要为我在SQL中所做的编写代码。我是否能够创建一个包含46列(我拥有的RptLOB数量)的临时表,并将这些RptLOB旋转到一行?非常感谢!有没有办法显示列标题(因为它包含其他RptLOB)?这最终将在动态sql中完成。@Kristina我不确定您所说的列标题是什么意思?当获取@colspivot
@bluefeet的值时,会在动态sql中检索列标题。最终,我将编写一个动态sql语句,以便它吐出整个相关表,并希望它显示列名。基本上,这个相关矩阵将在另一个表中。@Kristina我不明白你在问什么,你能发布一个你需要的最终结果的样本吗?@Kristina你想把列标题作为表中的一行吗?