Define Constraints dialog box

Lets you define or redefine a data entry constraint for a table.

Name is a read-only identifier, and is automatically generated when you create a new constraint.

Value is a dBASE expression that evaluates to true or false, providing record-level constraints on data entry. For example, you could enter a simple constraint

 sold<=bought

or create a more complex constraint that uses other features of the new DBF7 format:

 isblank( :last name:) or upper( :last name:) == :last name:

How to get there: Click New or Modify in the Constraints Property Builder.