Converting SQL Rank() to LINQ, or alternative

Question

I have the below SQL statement that works as desired/expected. However I would like to translate it into a LINQ statement(Lambda??) so that it will fit with the rest of my

Answer 1

Based on answer from @Totero but with a lamda implementation. Higher score = higher rank.

var rankedData = data.Select(s => new{
                    Ranking = data.Count(x => x.Value > s.Value)+1,
                    Name = s.Key,
                    Score = s.Value});

For this input:

{ 100, 100, 98, 97, 97, 97, 91, 50 }

You will get this output:

• Score : Rank
• 100 : 1
• 100 : 1
• 98 : 3
• 97 : 4
• 97 : 4
• 97 : 4
• 91 : 6
• 50 : 7

Answer 2

If you want to simulate rank then you can use following linq query.

      var q = (from s in class.student
                select new
                {
                    Name = s.Name,
                    Rank = (from o in class.student
                            where o.Mark > s.Mark && o.studentId == s.studentId
                            select o.Mark).Distinct().Count() + 1
                }).ToList();

you can use order by like:

      var q = (from s in class.student
                orderby s.studentId 
                select new
                {
                    Name = s.Name,
                    Rank = (from o in class.student
                            where o.Mark > s.Mark && o.studentId == s.studentId
                            select o.Mark).Distinct().Count() + 1
                }).ToList();

but order by does not matter in this query.

Answer 3

Here's a sample that shows how I would simulate Rank() in Linq:

   var q = from s in class.student
                 orderby s.Age descending
                 select new { 
                     Name = s.name, 
                     Rank = (from o in class.student
                             where o.mark > s.mark
                             select o).Count() + 1 
                 };

Answer 4

LINQ has rank funcionality built in, but not in the query syntax. When using the method syntax most linq functions come in two versions - the normal one and one with a rank supplied.

A simple example selecting only every other student and then adding the index in the resulting sequence to the result:

var q = class.student.OrderBy(s => s.studentId).Where((s, i) => i % 2 == 0)
.Select((s,i) => new
{
  Name = s.Name,
  Rank = i
}