Calculated column in EF Code First

Question

I need to have one column in my database calculated by database as (sum of rows) - (sum of rowsb). I\'m using code-first model to create my database.

Here is what I

Answer 1

I would go about this by just using a view model. For example rather than have the FirstTable class as a db entity would you not be better just having a view model class called FirstTable and then have a function that is used to return this class that would include the calculated sum? For example your class would just be:

public class FirstTable {
  public int UserID { get; set; }
  public double Sum { get; set; }
 }

And then you would have a function that you call that returns the calculated sum:

public FirsTable GetNetSumByUserID(int UserId)
{
  double income = dbcontext.Income.Where(g => g.UserID == UserId).Select(f => f.inSum);
  double expenses = dbcontext.Outcome.Where(g => g.UserID == UserId).Select(f => f.outSum);
  double sum = (income - expense);
  FirstTable _FirsTable = new FirstTable{ UserID = UserId, Sum = sum};
  return _FirstTable;
}

Basically the same as an SQL view and as @Linus mentioned I don't think it would be a good idea keeping the computed value in the database. Just some thoughts.