Re: regarding oid(object id)

let me share this simple test case:
pg=# create table myt(a int)with oids;
CREATE TABLE
pg=# select * from myt;
 a
---
(0 rows)

pg=# insert into myt values(1);
INSERT 16387 1

pg=# select a, oid from myt;
 a |  oid 
---+-------
 1 | 16387
(1 row)

Please read this section:
http://www.postgresql.org/docs/9.0/static/sql-createtable.html
http://www.postgresql.org/docs/9.0/static/sql-createtable.html#SQL-CREATETABLE-STORAGE-PARAMETERS

--
Chetan Sutrave
Senior Software Engineer
EnterpriseDB Corporation
The Enterprise PostgreSQL Company
Phone: +91.20.30589523

Website: www.enterprisedb.com
EnterpriseDB Blog: http://blogs.enterprisedb.com/
Follow us on Twitter: http://www.twitter.com/enterprisedb

This e-mail message (and any attachment) is intended for the use of the individual or entity to whom it is addressed. This message contains information from EnterpriseDB Corporation that may be privileged, confidential, or exempt from disclosure under applicable law. If you are not the intended recipient or authorized to receive this for the intended recipient, any use, dissemination, distribution, retention, archiving, or copying of this communication is strictly prohibited. If you have received this e-mail in error, please notify the sender immediately by reply e-mail and delete this message.