Converting SQL to LINQ to Entity - sql

Question

I am trying to convert the following SQL, not written by myself, into a Linq to Entity query.
select
u.user_Id,
u.forename,
u.surname,
u.client_code,
u.user_name,
u.password,
u.email,
u.gender,
u.Report_Date,
u.EmailDate,
count(ut.test_Id) as testcount,
sum(cast(isnull(ut.completed,0) as int)) as Testcompleted,
u.job_function,
lu.lookupvalue
from
users u inner join user_Relationship ur
on u.user_Id= ur.child_Id
left join user_tests ut
on ut.user_id=u.user_id
inner join lookup lu on u.first_languageId = lu.lookupid
where ur.parent_Id = #Parent_Id
group by
u.user_Id, u.forename,u.surname,u.client_code,u.user_name, u.password,
u.email, u.gender, u.first_languageId, u.Report_Date,u.EmailDate,
u.job_function, lu.lookupvalue
So far, I have been able to do this:
from u in db.Users
join ur in db.User_Relationship on u.User_ID equals ur.Child_ID
join ut in db.User_Tests on u.User_ID equals ut.User_ID into ps
from ut in ps.DefaultIfEmpty()
join lu in db.Lookups on u.First_LanguageID equals lu.LookupID
where ur.Parent_ID == 45875
select new UserViewModel
{
User_ID = u.User_ID,
Forename = u.Forename,
Surname = u.Surname,
Client_Code = u.Client_Code,
User_Name = u.User_Name,
Password = u.Password,
Email = u.Email,
Gender = u.Gender,
Report_Date = u.Report_date,
Email_Date = u.EmailDate,
//Insert Test_Count and Test_Completed
Job_Function = u.Job_Function,
Lookup_Value = lu.LookupValue
});
How do I replicate the Group and Count() function of SQL?

Answer 1

Well tweak around this solution coz currently i dont have .Net environment for testing this solution, but you'll sure get how grouping is done in linq.
from u in db.Users
join ur in db.User_Relationship on u.User_ID equals ur.Child_ID
join ut in db.User_Tests on u.User_ID equals ut.User_ID into ps
from ut in ps.DefaultIfEmpty()
join lu in db.Lookups on u.First_LanguageID equals lu.LookupID
where ur.Parent_ID == 45875 group new{u,lu} by new {u.User_ID,u.Forename,
u.Surname,u.Client_Code,
u.User_Name,u.Password,
u.Email,u.Gender,u.Report_date,
u.EmailDate,u.Job_Function,
lu.LookupValue} into g
let Test_Count = ps.Count(x=>x.test_Id)
let Test_Completed = ps.Sum(x=>x.completed)
select new UserViewModel
{
User_ID = g.Key.User_ID,
Forename = g.Key.Forename,
Surname = g.Key.Surname,
Client_Code = g.Key.Client_Code,
User_Name = g.Key.User_Name,
Password = g.Key.Password,
Email = g.Key.Email,
Gender = g.Key.Gender,
Report_Date = g.Key.Report_date,
Email_Date = g.Key.EmailDate,
Test_Count = Test_Count,
Test_Completed = Test_Completed,
Job_Function = u.Job_Function,
Lookup_Value = lu.LookupValue
});