SQL Unpivot multiple columns Data

问题:

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

And Here is the result of the above code.

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

But I want my Output to be the way indicated below

VendorID    Orders  Orders1
1           4       2
1           9       3

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

How can I achieve this?

回答1:

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);

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);

See SQL Fiddle with Demo