There are many reasons as to why you would prefer to use a computed column and one of them is its ability to assign a field to hold a specific total for something.
While others prefer not to use it and carry on with their own preferences, we can go ahead and play with it a bit and see how this can help us.
First, let's see what a computed column is. From MSDN, it says:
"A computed column is computed from an expression that can use other columns in the same table. The expression can be a noncomputed column name, constant, function, and any combination of these connected by one or more operators. The expression cannot be a subquery.'
