Using a user-defined type as a primary key

Posted by Chris Kaminski on Stack Overflow See other posts from Stack Overflow or by Chris Kaminski
Published on 2010-03-16T20:29:31Z Indexed on 2010/03/16 20:31 UTC
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Filed under:

database

|

database-design

|

database-theory

|

user-defined-types

Suppose I have a system where I have metadata such as:

table: 
====== 
   key 
   name 
   address 
   ...

Then suppose I have a user-defined type described as so:

datasource 
datasource-key

A) are there systems where it's possible to have keys based on user-defined types?
B) if so, how do you decompose the keys into a form suitable for querying? C) is this a case where I'm just better off with a composite primary key?

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