O kyrios Nosyman egrapse stis Sep 2, 2004 :
> 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?
Yes a unique index is created automatically so as to enforce the
PK constraint.
>
> Thanks
>
>
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--
-Achilleus