SQL Unpivot 多列数据 [英] SQL Unpivot multiple columns Data

问题描述

我正在使用 SQL Server 2008 并且我正在尝试对数据进行逆透视.这是我正在使用的 SQL 代码，

I am using SQL server 2008 and I am trying to unpivot the data. Here is the SQL code that I am using,

CREATE TABLE #pvt1 (VendorID int, Sa int, Emp1 int,Sa1 int,Emp2 int)
GO
INSERT INTO #pvt1  VALUES (1,2,4,3,9);

GO

--Unpivot the table.
SELECT distinct VendorID,Orders,Orders1
FROM 
   (SELECT VendorID, Emp1, Sa,Emp2,Sa1
   FROM #pvt1 ) p
UNPIVOT
   (Orders FOR Emp IN 
      (Emp1,Emp2)
)AS unpvt
UNPIVOT
   (Orders1 FOR Emp1 IN 
      (Sa,Sa1)
)AS unpvt1;
GO

这是上面代码的结果.

VendorID    Orders  Orders1
1            4      2
1            4      3
1            9      2
1            9      3

但我希望我的输出如下所示

But I want my Output to be the way indicated below

VendorID    Orders  Orders1
1           4       2
1           9       3

以上代码的关系是2与4相关，3与9相关.

The relationship from the above code is 2 is related to 4, and 3 is related to 9.

我怎样才能做到这一点?

How can I achieve this?

推荐答案

反透视数据的一种更简单的方法是使用 CROSS APPLY 对成对的列进行反透视:

An easier way to unpivot the data would be to use a CROSS APPLY to unpivot the columns in pairs:

select vendorid, orders, orders1
from pvt1
cross apply
(
  select emp1, sa union all
  select emp2, sa1
) c (orders, orders1);

参见SQL Fiddle with Demo.或者，如果您不想使用 UNION ALL，您可以将 CROSS APPLY 与 VALUES 子句一起使用:

See SQL Fiddle with Demo. Or you can use CROSS APPLY with the VALUES clause if you don't want to use the UNION ALL:

select vendorid, orders, orders1
from pvt1
cross apply
(
  values 
    (emp1, sa),
    (emp2, sa1)
) c (orders, orders1);

参见SQL Fiddle with Demo

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