Multiple group by and Sum LINQ

Question

I have a products sales table that looks like this:

saleDate     prod        qty
10/22/09     soap        10
09/22/09     pills       05
09/25/09     soap            


        

Answer 1

Sure.

It'll look like this:

var GroupedSales = 
      from p in products 
      group p by p.saleDate.Month into g 
      select new { saleMonth = g.saleDate.Month, QtySold = g.Sum(p => p.qty) }; 

See: http://msdn.microsoft.com/en-us/vcsharp/aa336747.aspx#sumGrouped

Also, note that I was operating under the assumption that your dataset only had 2009 data. If you want to group by month/year, you can use saleDate.ToString("yyyyMM") instead of saleDate.Month.