RE: Primary Keys optional?
- From: "Guerra, Abraham J" <AGUERRA@xxxxxxxxx>
- To: <andert@xxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 17 Aug 2006 11:53:16 -0500
Is there referential integrity? You need PK for RI.
Abraham Guerra
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Stephen Andert
Sent: Thursday, August 17, 2006 11:47 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: Primary Keys optional?
OK, just starting a new job with more design than I have done in a
while. Looking into things, I have been noticing that many tables
have no PK. Some have a unique index, but not all.
When I pointed this out to folks (developers) they shrugged and said
"if you need a PK, then create one".
So my questions are:
1. Is it considered acceptable to have a unique index instead of a pk?
2. What are the circumstances when a table might be allowed to exist
without any sort of primary key or unique index? (i.e. temp table,
static small table, etc)
Thanks In Advance
--
Stephen Andert
http://spaces.msn.com/andert-news/
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