On 08/25/2015 09:09 AM, Rob Sargent wrote:
On 08/25/2015 09:40 AM, Melvin Davidson wrote:Adrian, Stop being so technical. When we/I speak of natural keys, we are talking about the column that would NATURALly lend itself as the primary key. No one ever said a number is not natural. just that there is no need to duplicate uniqueness with a separate number. IOW: If we have an account table, then the account_id or account_no would be the primary key. There is no need to have a separate serial id as the primary key.If I'm following correctly, you're saying that if the definition of the entity contains and arbitrary unique value then use that. Fine. I guess I quibble with the notion of VIN as a "natural" attribute of car. (I have no firsthand experience with VINs but I would bet there's information tucked inside them, which would make me sceptical of using them :) )
But a VIN is in fact, UNIQUE so it is useful as a PK. JD -- Command Prompt, Inc. - http://www.commandprompt.com/ 503-667-4564 PostgreSQL Centered full stack support, consulting and development. Announcing "I'm offended" is basically telling the world you can't control your own emotions, so everyone else should do it for you. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
