SQL - Simple Pivot Table while using Join statements? - sql

Question

I'm trying to transpose my results from the following code which is joining multiple tables together. I know i need to use a PIVOT for this and it may be a simple fix, but i'm having huge difficultly getting the code to work. My code is as follows:
SELECT F.SetValue, D.Name FROM Device D
INNER JOIN Location L ON D.LocationId = L.LocationId
INNER JOIN Fitting F ON L.LocationId = F.LocationId
INNER JOIN LocationTypeFitting LTF ON F.LocationTypeFittingId = LTF.LocationTypeFittingId
WHERE D.DeviceName = 'Device 1' AND LTF.Name LIKE '%Television%';
which prints the following results:
SetValue | Name
===========================
1 | TV_Power
1 | TV_Volume
1 | TV_Source
I need to return the values as below:
TV_Power | TV_Volume | TV_Source
================================
1 | 1 | 1
I know i'll also need a GROUP BY statement, but the the joining of additional tables is making this particular query increasingly difficult. Any help would be very much appreciated.

Answer 1

I would do the following two things:
Wrap the whole query in a sub-query and apply the pivot syntax.
Add another column, such as DeviceName from the Device table (or some other table), so that you can differentiate the rows once the pivot has been executed (I assume there will be more than one row).
it also shows where the group by would go in the comments.
select post_pivot.*
from (
SELECT F.SetValue, D.Name, D.DeviceName FROM Device D
INNER JOIN Location L ON D.LocationId = L.LocationId
INNER JOIN Fitting F ON L.LocationId = F.LocationId
INNER JOIN LocationTypeFitting LTF ON F.LocationTypeFittingId = LTF.LocationTypeFittingId
WHERE D.DeviceName = 'Device 1' AND LTF.Name LIKE '%Television%'
--group by (if needed)
) as pre_pivot
pivot (max(pre_pivot.set_value) for pre_pivot.Name in ([TV_Power], [TV_Volume], [TV_Source])) as post_pivot

Answer 2

Hopefully this will be sufficient or will give you enough to go on.
SELECT 'DeviceType' as DeviceTYpe,* FROM
(
SELECT D.Name, F.SetValue FROM Device D
INNER JOIN Location L ON D.LocationId = L.LocationId
INNER JOIN Fitting F ON L.LocationId = F.LocationId
INNER JOIN LocationTypeFitting LTF ON F.LocationTypeFittingId = LTF.LocationTypeFittingId
WHERE D.DeviceName = 'Device 1' AND LTF.Name LIKE '%Television%'
) AS SourceTable
PIVOT
(
MAX(SetValue)
FOR Name in ([TV_Power], [TV_Volume], [TV_Source])
) As PivotTable