> > Do we want the above syntax, or this syntax:
> >
> > ALTER TABLE blah ALTER COLUMN col SET NOT NULL;
> > ALTER TABLE blah ALTER COLUMN col SET NULL;
> 
> My only objection to the second command is that it's plain wrong.  You
> don't set anything to NULL, so don't make the command look like it.

Imho it would be nice if the command would look exactly like a create 
table. It is simply convenient to use cut and paste :-) And I haven't 
seen a keyword yet, that would make it more descriptive, certainly not SET.

ALTER TABLE blah ALTER [COLUMN] col [int4] [NOT NULL] [DEFAULT 32];
ALTER TABLE blah ALTER [COLUMN] col [int8] [NULL] [DEFAULT 32];
maybe even [DEFAULT NULL] to drop the default :-)

Andreas


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