> 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.

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