sql query including month columns? - sql

Question

I was wondering if I could get some ideas or direction on a sql query that would output column months. Here is my current query..
select A.assetid, A.Acquisition_Cost, B.modepreciaterate from FA00100 A
inner join FA00200 B on A.assetindex = B.assetindex
where MoDepreciateRate != '0'
I would like to add more columns that look as such:
select assetid, acquisition_cost, perdeprrate, Dec_2012, Jan_2013, Feb_2013....
where Dec_2012 = (acquisition_cost - MoDepreciateRate*(# of months))
and Jan_2013 = (acquisition_cost - MoDepreciateRate*(# of months))
where # of months can be changed.
Any help would be really appreciated. Thank you!
Here is an example of what I would like the output to be with '# of months' = 4
assetid SHRTNAME Acquisition_Cost perdeprrate Dec_2012 Jan_2013 Feb_2013 Mar_2013
CS-013 GEH INTEG 17490.14 485.83 17004.31 16518.48 16032.65 15546.82
CS-014 WEB BRD 14560 404.4507 14155.5493 13751.0986 13346.6479 12942.1972

Answer 1

Try This:
--setup
create table #fa00100 (assetId int, assetindex int, acquisitionCost int, dateAcquired date)
create table #fa00200 (assetIndex int, moDepreciateRate int, fullyDeprFlag nchar(1), fullyDeprFlagBit bit)
insert #fa00100
select 1, 1, 100, '2012-01-09'
union select 2, 2, 500, '2012-05-09'
insert #fa00200
select 1, 10, 'N', 0
union select 2, 15, 'Y', 1
.
--solution
create table #dates (d date not null primary key clustered)
declare #sql nvarchar(max)
, #pivotCols nvarchar(max)
, #thisMonth date
, #noMonths int = 4
set #thisMonth = cast(1 + GETUTCDATE() - DAY(getutcdate()) as date)
select #thisMonth
while #noMonths > 0
begin
insert #dates select DATEADD(month,#noMonths,#thisMonth)
set #noMonths = #noMonths - 1
end
select #sql = ISNULL(#sql + NCHAR(10) + ',', '')
--+ ' A.acquisitionCost - (B.moDepreciateRate * DATEDIFF(month,dateAcquired,''' + convert(nvarchar(8), d, 112) + ''')) ' --Original Line
+ ' case when A.acquisitionCost - (B.moDepreciateRate * DATEDIFF(month,dateAcquired,''' + convert(nvarchar(8), d, 112) + ''')) <= 0 then 0 else A.acquisitionCost - (B.moDepreciateRate * DATEDIFF(month,dateAcquired,''' + convert(nvarchar(8), d, 112) + ''')) end ' --new version
+ quotename(DATENAME(month, d) + '_' + right(cast(10000 + YEAR(d) as nvarchar(5)),4))
from #dates
set #sql = 'select A.assetid
, A.acquisitionCost
, B.moDepreciateRate
,' + #sql + '
from #fa00100 A
inner join #fa00200 B
on A.assetindex = B.assetindex
where B.fullyDeprFlag = ''N''
and B.fullyDeprFlagBit = 0
'
--nb: B.fullyDeprFlag = ''N'' has double quotes to avoid the quotes from terminating the string
--I've also included fullyDeprFlagBit to show how the SQL would look if you had a bit column - that will perform much better and will save space over using a character column
print #sql
exec(#sql)
drop table #dates
.
--remove temp tables from setup
drop table #fa00100
drop table #fa00200