how to take previous month result in sql

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VS2010

i have 2 tables which is 'ms' and 'fr'.
'ms' contain the pid,month, and totalsales meanwhile 'fr' contain pid, month, n forecast. IN both table, each pid has 12 record based on month.
i actually want to calculate the demand where the formula is = (0.3* totalsales)+(0.7* previous month result of forecast). The previous month result of forecast is like when the user choose pid2 and month 2 , then it will take the forecast result from month 1 as its calculation data.

i tried it already but the desired result is not coming out.
below is my code

SQL

select ((0.3*totalsalesamount)+(0.7*forecastdemand)) as demand from Monthlysales, forecastreorder where Monthlysales.P_ID = forecastreorder.Productid and Monthlysales.P_ID = 1 and forecastreorder.Month = 2

when i execute the code above, the result is based on their each forecast result. for example, when i choose pid 1, month 2, then it will take the forecast result from month 2 also. meanwhile i want it to take the forecast result from month 1 as its calculation data.
how can i do that??
please help me, thanks in advanced :)

Posted 30-May-14 20:33pm

hahaahahaahahhahahahhahaha

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Maciej Los 31-May-14 6:19am

Not clear... ;(

1 solution

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Peter Leow · Answer 1 · 2014-05-31T07:30:00

Solution 1

Try this:

SQL

select ((0.3*totalsalesamount)+(0.7*forecastdemand)) as demand
from Monthlysales join forecastreorder
on Monthlysales.P_ID = forecastreorder.Productid
where Monthlysales.P_ID = 1
and Monthlysales.month = 2
and forecastreorder.Month = 1

Posted 31-May-14 7:30am

Peter Leow