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@lfix.co.uk
Isle of Wight http://www.lfix.co.uk/oliver
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