Delete duplicates using Lambda

Question

I need some help using a lambda expression to remove duplicate entries in my Entity Framework context. I have a table with the following columns:

Id, DateOfIncide

Answer 1

var query = db.Incidents.Where(x => x.IsAttendanceIncident == "Y")
                .GroupBy(x => new { x.Id, x.EmployeeId, x.DateOfIncident, x.IsAttendanceIncident })
                .Select(x => x.FirstOrDefault());


var query2 = from duplicate in db.Incidents
                 .Where(x => x.IsAttendanceIncident == "Y" && !query.Any(i => i.Id == duplicate.Id));

query2 will now just contain the duplicates?