Question

Is there any way to create Linq2SQL query, that will be translated to this:

SELECT  COUNT(*) as totalCount ,
 SUM(v.field1) AS totalfield1,
....
 SUM(v.<fieldN>) AS total<fieldN>
FROM    [dbo].[SomeTable] v

Answer 1

You can try something like

var query = from p in SalesOrderDetails 
         group p by p.ProductID into g
          select  new
          {id =  g.Key, Count = g.Count(), Sum = g.Sum(p => p.OrderQty)};   

Console.Write(query);

but your solution of using fake key and then enumerating seems much better.

var query = from p in SalesOrderDetails 
         group p by p.ProductID into g
        select  new
  {id =  g.Key, FalseKey = 1, Count = g.Count(), Sum = g.Sum(p => p.OrderQty) };

//Console.Write(query);
var result = from q in query
                  group q by q.FalseKey into c
                  select new { summation = c.Sum(q => q.Sum)};

Console.Write(result);