> I was wondering if there might be something along the lines of an ALTER
> CONSTRAINT clause, which could change a specific aspect of a constraint
> without having to re-specify the whole thing.
As you see from this link:
http://www.postgresql.org/docs/8.2/interactive/sql-commands.html
There is no alter constraint command.
However for the Alter table syntax this link shows pretty much all you can do:
http://www.postgresql.org/docs/8.2/interactive/sql-altertable.html
Regards,
Richard Broersma Jr.