I define a table, Permits, that includes a column for type. Permit_Type is a domain with permissible names: CREATE DOMAIN Permit_Type as TEXT CHECK (value in ('Environmental', 'Health', 'Safety', 'Occupancy')); Can I name that domain check within the Permits table as follows? CREATE TABLE Permits ( ... type Permit_Type CONSTRAINT invalid_permit_type ... ); If not, does the constraint name belong in the domain definition? Rich -- Richard B. Shepard, Ph.D. | The Environmental Permitting Applied Ecosystem Services, Inc. | Accelerator(TM) <http://www.appl-ecosys.com> Voice: 503-667-4517 Fax: 503-667-8863