Re: alter table

On Fri, Nov 30, 2001 at 11:44:12AM -0500, Gregory Wood wrote:
> According to the documentation:
>
> ALTER TABLE table [ * ] ADD [ COLUMN ] column type

[. . .]

> You'll no doubt also want to add that NOT NULL constraint:
>
> ALTER TABLE table ADD table constraint definition
>
> I know this only because it bit me in the ass the other day too :)

Also according to the documentation:

----

In the current implementation, default and constraint clauses for
the new column will be ignored. You can use the SET DEFAULT form of
ALTER TABLE to set the default later. (You will also have to update
the already existing rows to the new default value, using UPDATE.)

In the current implementation, only FOREIGN KEY constraints can be
added to a table. To create or remove a unique constraint, create a
unique index (see CREATE INDEX). To add check constraints you need to
recreate and reload the table, using other parameters to the CREATE
TABLE command.
----

So you can't add a NOT NULL constraint. There's a handy ip on
techdocs, though (written by someone else) as to how to change things
to enfoce NOT NULL.

A

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