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

Since op mentioned learning syntax, here's a fluent version:

company_user
    .Where(x => x.company_id == 1)
    .Join(
        user,
        x => x.user_id,
        x => x.user_id,
        (o,i) => new { 
            FirstName = i.firstName, 
            LastName = i.lastName,
            InvoiceCount = invoice.Count(y => y.user_id == o.user_id),
            InvoiceSum = invoice.Where(y => y.user_id == o.user_id).Sum(y => y.amount)
        }
    ).GroupBy(x => new { x.FirstName, x.LastName })
    .Distinct()