RE: Primary keys vs. unique indexes

From: Kieran Murray <Kieran.Murray_at_esat.com>
Date: Thu, 30 Nov 2000 09:29:45 -0000
Message-Id: <10696.123296@fatcity.com>

Creating a primary key will also mean creating an index, but one that only allow unique non-null values, the unique index constraint will permit both unique values and NULL values.

Regards,
Kieran

-----Original Message-----
From: cemail_at_sprintmail.com [mailto:cemail_at_sprintmail.com] Sent: 30 November 2000 06:00
To: Multiple recipients of list ORACLE-L Subject: Primary keys vs. unique indexes

What is the difference between building a table and including the primary key versus building the table and then having creating a unique index on the same keys? When you create a table with a primary key, doesn't Oracle store it as an index anyway?

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Received on Thu Nov 30 2000 - 03:29:45 CST