How to convert SQL Query into LinQ - sql-server

Question

I'm new to SQL, please Help me how to convert this query into LinQ
This is My Table Dept:
Id Name Sal Department
1 John 40000 Dotnet
2 mick 45000 DotNet
3 Pillay 777 Sql
Here I want to display Salary Based On Department Name, like:
DepartmentName ToalSal
Dotnet 85000
Sql 777
select DeprtmentName,sum(sal) from Dept_Emp Group by DeprtmentName
I wrote some Part of query
public IEnumerable<Dept_Emp> GetJam()
{
var x = from n in db.Dept_Emp
group n by n.Sal into g
select new
{
DeprtmentName = g.Key
};
// what I mention Here;
}

Answer 1

You are missing calculating sum of sal fields of grouped entities. Also you are grouping by wrong field. You should use department name for grouping
from de in db.Dept_Emp
group de by de.DeprtmentName into g
select new {
DepartmentName = g.Key,
TotalSalary = g.Sum(x => x.Sal) // aggregation here
}
What you have as output is anonymous objects. You cannot return them directly from method. You have several options here
Create custom class like DepartmentTotals with name and total salary fields, and return instances of this class instead of anonymous objects. Then return type will be IEnumerable<DepartmentTotals>.
Create Tuple<string, int> (or whatever type of salary). And return such tuples.
Use C# 7 tuples.