Re: columns of a unique index

From: Finn Jorgensen <>
Date: Wed, 14 May 2008 16:03:26 -0400
Message-ID: <>

It is allowed to have nullable columns in a unique index. However, in a Primary Key constraint all the columns has to be NOT NULL.

A unique key could more accurately be referred to as an Alternate Key.


On 5/14/08, Oxnard Montalvo <> wrote:
> Think it is ok to have them nullable? why or why not. Seem like in general they act as another PK on a table.
> --

Received on Wed May 14 2008 - 15:03:26 CDT

Original text of this message