Question

I would like to get the sum of a column from database but the query returns -1. I have this query:

SELECT SUM(total) 
FROM bon
WHERE        
  (DATEPART(dd, data_adaugare) = DATEPART(dd, @p1)) 
  AND (DATEPART(mm, data_adaugare) = DATEPART(mm, @p1)) 
  AND (DATEPART(yy, data_adaugare) = DATEPART(yy, @p1))

and the code from C#:

decimal sumaa = 0;
DataTable suma = bonTableAdapter.Suma(DateTime.Now);

foreach (DataRow r in suma.Rows)
{
   sumaa += Convert.ToDecimal(r.ItemArray[0]);
}

Answer 1

total column in any record might be null. In that case use this.

SELECT SUM(isnull(total, 0))...