Don't know why I've not come across this before, but I have now. In a table definition I reference the primary key of another table. That key is of datatype SERIAL. In the referencing table, do I define the column as col_name INTEGER REFERENCES other-table (primary_key_field), or is the datatype SERIAL because that's what the referenced primary_key_field is? Thanks, Rich -- Dr. Richard B. Shepard, President Applied Ecosystem Services, Inc. (TM) <http://www.appl-ecosys.com> Voice: 503-667-4517 Fax: 503-667-8863 ---------------------------(end of broadcast)--------------------------- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to majordomo@xxxxxxxxxxxxxx so that your message can get through to the mailing list cleanly