Re: PRIMARY KEY and INDEX

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Hi,

On Thu, 2 Sep 2004, Nosyman wrote:

> It is necessary to define an index for a primary key column?
>
> Let's have an example
> CREATE TABLE users(
> id_user INTEGER PRIMARY KEY,
> user_name VARCHAR(25)
> );
>
> Does PgSQL automatically create an index for id_user (primary key) or it
> must be created by hand?

You could give it a try before asking:

test=# CREATE TABLE users(
test(# id_user INTEGER PRIMARY KEY,
test(# user_name VARCHAR(25)
test(# );
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index 
"users_pkey" for table "users"
CREATE TABLE

Regards,
- --
Devrim GUNDUZ 
devrim~gunduz.org				devrim.gunduz~linux.org.tr			http://www.tdmsoft.com			http://www.gunduz.org
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