Birthdates can change. Do your users never make typo's when entering data?

-----Original Message-----
From: Justin Taylor [mailto:JUSTIN@xxxxxxxxxxxxx]
Sent: Monday, August 28, 2017 12:40 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Subject: RE: Database design question

Why would you ever willingly choose not to have a primary key?

-----Original Message-----
From: Raul Jager [mailto:raul@xxxxxxxxxx]
Sent: Monday, August 28, 2017 12:33 PM
To: midrange-l@xxxxxxxxxxxx
Subject: Re: Database design question

A primary key is a good idea, but not really necessary. If you have a field, or group of fields that are unique, and that are very unlikely to change (like birth date) you can use as primary key.  DB2  handles very well a primary key that has several fields, so you can use it.  Some other databases will only work well with a single field as primary key, and even will require correlative numbers.


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