Addition with NULL values

Question

In a stored procedure (Oracle in my case), I want to add some values to an existing record. Problem is that both the existing value and the value to be added can be null. I

Answer 1

You can also use ISNULL, so if you have 3 values

isnull(val1,0)+isnull(val2,0)+isnull(val3,0)

which ever column will have a NULL will use a 0, otherwise its original value.