LINQ Query with grouping and ranking

Question

I have a sql table called predictions with data as below

Week    Player     Points
201101  Mark       7
201101  Mark       7
201101  Pete       7
201101  Pet         


        

Answer 1

Just pass a datatable to following function (Please note that the code is in c#) //dt should contain column points but not rank column

 public static DataTable GetRankedDatatable(DataTable dt)
            {
                var rankedDt = (from row in dt.AsEnumerable()
                                orderby row.Field("points")
                                select row).CopyToDataTable();
                rankedDt.Columns.Add("rank");
                int rank = 0;
                for (int i = 0; i < rankedDt.Rows.Count - 1; i++)
                {
                    rankedDt.Rows[i]["rank"] = rank;
                    if (rankedDt.Rows[i]["points"].ToString() != rankedDt.Rows[i + 1]["points"].ToString())
                    {
                        rank++;
                    }
                }
                rankedDt.Rows[rankedDt.Rows.Count - 1]["rank"] = rank;
                return rankedDt;
            }