SQL transpose full table - sql

Question

I need to do the following transpose in MS SQL
from:
Day A B
---------
Mon 1 2
Tue 3 4
Wed 5 6
Thu 7 8
Fri 9 0
To the following:
Value Mon Tue Wed Thu Fri
--------------------------
A 1 3 5 7 9
B 2 4 6 8 0
I understand how to do it with PIVOT when there is only one column (A) but I can not figure out how to do it when there are multiple columns to transpose (A,B,...)
Example code to be transposed:
select LEFT(datename(dw,datetime),3) as DateWeek,
sum(ACalls) as A,
Sum(BCalls) as B
from DataTable
group by LEFT(datename(dw,datetime),3)
Table Structure:
Column DataType
DateTime Datetime
ACalls int
BCalls int
Any help will be much appreciated.

Answer 1

In order to transpose the data into the result that you want, you will need to use both the UNPIVOT and the PIVOT functions.
The UNPIVOT function takes the A and B columns and converts the results into rows. Then you will use the PIVOT function to transform the day values into columns:
select *
from
(
select day, col, value
from yourtable
unpivot
(
value
for col in (A, B)
) unpiv
) src
pivot
(
max(value)
for day in (Mon, Tue, Wed, Thu, Fri)
) piv
See SQL Fiddle with Demo.
If you are using SQL Server 2008+, then you can use CROSS APPLY with VALUES to unpivot the data. You code would be changed to the following:
select *
from
(
select day, col, value
from yourtable
cross apply
(
values ('A', A),('B', B)
) c (col, value)
) src
pivot
(
max(value)
for day in (Mon, Tue, Wed, Thu, Fri)
) piv
See SQL Fiddle with Demo.
Edit #1, applying your current query into the above solution you will use something similar to this:
select *
from
(
select LEFT(datename(dw,datetime),3) as DateWeek,
col,
value
from DataTable
cross apply
(
values ('A', ACalls), ('B', BCalls)
) c (col, value)
) src
pivot
(
sum(value)
for dateweek in (Mon, Tue, Wed, Thu, Fri)
) piv