On Sat, 2005-10-08 at 22:36 -0700, Miles Keaton wrote: > ... both isbn and name MUST be in the table, and what I'm > trying to do is put a CONSTRAINT on the table definition to protect > against user error, by making sure that any entered isbn is only tied > to one book-name in that table. Create a separate table with the two columns name and isbn which are that table's primary key; on the main table, create a foreign key to the new table. -- Oliver Elphick olly@xxxxxxxxxx Isle of Wight http://www.lfix.co.uk/oliver GPG: 1024D/A54310EA 92C8 39E7 280E 3631 3F0E 1EC0 5664 7A2F A543 10EA ======================================== Do you want to know God? http://www.lfix.co.uk/knowing_god.html ---------------------------(end of broadcast)--------------------------- TIP 1: 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
