> So for most applications written against this database, they're probably
> assuming only one email address in this column.
>
> And then you confuse the issue by putting two or more comma-separated
> addresses, which are not universally usable when a single address
> is provided.
Surely not Randal. Client application developers can simply read the
regex in the check constraint to see its behaviour :-)
Regards,
Peter Geoghegan