Simple sql to Linq query with group by and aggregate functions

Question

I\'m fighting with linq trying to learn the syntax and I can\'t figure out how to do the following simple query

SELECT DISTINCT
    user.firstname,
    user.last         


        

Answer 1

The query you're after should be pretty close to this:

var query =
    from cu in company_user
    where cu.company_id == 1
    join u in user on cu.user_id equals u.user_id
    join i in invoice on u.user_id equals i.user_id
    group i.amount by new
    {
        u.firstname,
        u.lastname,
    } into gs
    select new
    {
        firstname = gs.Key.firstname,
        lastname = gs.Key.lastname,
        count = gs.Count(),
        sum = gs.Sum(),
    };

Enjoy!