Multiple select against one table in one query - sql

Question

I'm trying to construct a select statement that will give me a percentage value for each month and user.
I have a table with rows that looks like this;
Table name: pytrans
tTransDate tArtCode tTime tSignature
20120801 DKK 1 30JK
20120801 AD 1.5 30JK
20120802 DKB 3 40AK
20120903 MI 2 45TR
20120904 DKK 2 30JK
20120904 DKB 2 30JK
The select(s) should give me the percentage of how much time spent on tArtCode DKB or DKK for each signature and month of all time spent on all tArtCode. So from the above example the select should give me 40% for signature 30JK in month 8 and 100% for signature 30JK in month 9.
I have tried different kind of sql select statements but It doesn’t seem to get 100% right.
This is what I’ve got;
select DATEPART(YY, tTransdatum) AS Year, DATEPART(mm, tTransdatum) AS Month, tSignatur,
(select SUM(tAntal) AS SumPart from pytrans where tSignatur = '30JK' AND (tArtikelkod = 'DKK' OR tArtikelkod = 'DKB'))
/(select DATEPART(YY, tTransdatum) AS Year, DATEPART(mm, tTransdatum) AS Month, SUM(tAntal) AS SumTot from pytrans where tSignatur = '30JK' GROUP BY Year, Month, SumTot) * 100
From pytrans where tSignatur = '30JK' GROUP BY DATEPART(mm, tTransdatum), DATEPART(YY, tTransdatum), tSignatur
This SQL don’t work the error is that I can’t group Year, Month, SumTot. Also i get error; Only one expression can be specified in the select list when the subquery is not introduced with EXISTS.
This next sql select give me what i want but I’m to specific what I’m asking for... so to speak. If I use this sql i then need to have a sql query for every signature and every month, and that’s not really creative.
select TOP 1 DATEPART(YY, tTransdatum) AS Year, DATEPART(mm, tTransdatum) AS Month, tSignatur,
SumProc = (select SUM(tAntal) from pytrans
where tSignatur = '30JK' AND (tArtikelkod NOT LIKE 'FL' AND tArtikelkod NOT LIKE 'SEM' AND tArtikelkod NOT LIKE 'KOMPIN') AND (tArtikelkod = 'DKK' OR tArtikelkod = 'DKB') AND tTransdatum BETWEEN '20121101' AND '20121131')
/ (select SUM(tAntal) from pytrans
where tSignatur = '30JK' AND (tArtikelkod NOT LIKE 'FL' AND tArtikelkod NOT LIKE 'SEM' AND tArtikelkod NOT LIKE 'KOMPIN') AND tTransdatum BETWEEN '20121101' AND '20121131') * 100
from pytrans
Where tSignatur = '30JK' AND tTransdatum BETWEEN '20121101' AND '20121131'
group by tTransdatum, tSignatur
I’ve also tried Union but that doesn’t seem to work for me.
I really need help with this! Thanks!

Answer 1

Create Table #pytrans(tTransdatum datetime, tArtCode varchar(10), tAntal float, tSignature varchar(10))
insert into #pytrans Values('20120801', 'DKK', 1 ,'30JK')
insert into #pytrans Values('20120801', 'AD', 1.5 ,'30JK')
insert into #pytrans Values('20120802', 'DKB', 3 ,'40AK')
insert into #pytrans Values('20120903', 'MI', 2 ,'45TR')
insert into #pytrans Values('20120904', 'DKK', 2 ,'30JK')
insert into #pytrans Values('20120904', 'DKB', 2 ,'30JK')
Select a.Year,a.Month,a.tSignature,a.SumPart as aAll,b.SumPart as bAll,Case when b.SumPart =0 then NULL else a.SumPart/b.SumPart * 100 end as [Percent]
from
(select DATEPART(YY, tTransdatum) AS Year, DATEPART(mm, tTransdatum) AS Month, tSignature
,SUM(tAntal) AS SumPart
from #pytrans
where tSignature = '30JK' AND tArtCode in( 'DKK' ,'DKB')
Group by DATEPART(YY, tTransdatum) , DATEPART(mm, tTransdatum) , tSignature) a
Left Join
(select DATEPART(YY, tTransdatum) AS Year, DATEPART(mm, tTransdatum) AS Month, tSignature
,SUM(tAntal) AS SumPart
from #pytrans
where tSignature = '30JK'
Group by DATEPART(YY, tTransdatum) , DATEPART(mm, tTransdatum) , tSignature) b
on a.Month=b.Month and a.Year =b.Year and a.tSignature = b.tSignature