If you don't want to change your database, you can write and display a Formula Field, eg:
if isnull {yourfield} then 0
else {yourfield}
This sort of logic can do other things, e.g. "No value", though then it would insist on totext({yourfield}) rather than mixing numeric and character.
All of this is Crystal 8.5. In a lot of cases it is useful to distinguish between a zero value and a null or unknown value. Madawc Williams
East Anglia
Great Britain