RE: Removing all NOT NULL constraints from multiple tabl es easily

If you do a pg_dump on the db, the first part of the data will be the create
script. Just pull that part of the file off and alter it.

John

-----Original Message-----
From: Dan Browning [mailto:danb(at)cyclonecomputers(dot)com]
Sent: Monday, September 11, 2000 8:58 AM
To: 'Sokel, John'; pgsql-novice(at)postgresql(dot)org
Subject: RE: [NOVICE] Removing all NOT NULL constraints from multiple tables
easily

Does anyone have a program (or psql command?) that will analyze a table and
generate a CREATE TABLE ... statement? I ask because I don't have the
create table statements handy, and it would take a while for me to recreate
them (plus spelling errors, etc.)

-----Original Message-----
From: Sokel, John [mailto:jsokel(at)mdsi-usa(dot)com]
Sent: Monday, September 11, 2000 6:57 AM
To: Dan Browning
Subject: RE: [NOVICE] Removing all NOT NULL constraints from multiple tables
easily

I don't think you can alter that on the fly, but an easier way is too just
use 'select into' a temporrary table, recreate, and insert the data back to
the original file. That's what I always do, usually pretty quick (unless
you have gobs of data).

** Create a temporrary table
Select * into <temp_table> from <orig_table>;

** Recreate the file
Drop table <orig_table>;
Create table <orig_table> ...;

** Put the data back in
Insert into <orig_table> select * from <temp_table>;

** Clean up
Drop table <temp_table>;

-----Original Message-----
From: Dan Browning [ mailto:danb(at)cyclonecomputers(dot)com
<mailto:danb(at)cyclonecomputers(dot)com> ]
Sent: Monday, September 11, 2000 8:32 AM
To: pgsql-general(at)postgresql(dot)org; pgsql-novice(at)postgresql(dot)org
Subject: [NOVICE] Removing all NOT NULL constraints from multiple tables
easily

I would like to remove all NOT NULL constraints from my tables.

I've tried ALTER TABLE, but I can't seem to get the syntax right, and the
docs aren't clear to me.
What is the correct syntax? If there's another way, short of manually
recreating (dump, create, import) the tables, I'd love to hear it.

Thanks,

Dan Browning
Network & Database Administrator
Cyclone Computer Systems