>Hi Dragan
>
>The question is for each field the valid values
>can be actual value (know to the user) or null (for value not known to the user) in the sql field.
>
>e.g. if we have a field called salary then the valid
>values can be Zero to some figure. But if the user
>does not have the information for that field then
>the value should be null.
>
>Please note that in above example even Zero
>is a valid value. Hence Zero and null value
>have there own meaning.
>
>Zero salary can be valid for a director of a company.
>Null value can be valid for a person for whom we don't have any information.
>
>Question here is how should be our data entry screen.

Some thoughts at http://fox.wikis.com/wc.dll?Wiki~NullUI~Wiki .