I've made tables that have id, version as the primary key, plus a "current" field. Then I have a view that only selects the "current" items, and use whichever is appropriate. Something like this- 
create table all_properties (
  id int primary key; // Same across all different versions!
  vers int primary key;
  current boolean;
  created_by char(40);
  created_on date;
  property_name, property_value, etc....
)

create view current_properties as
 select * from all_properties where current=boolean;

[download]
Then you don't get the storage hit and headaches that materialized views can give you, and it's rather clean conceptually.

You probably still want a trigger to be sure "current" is only true for one version.

(I cheat a bit by letting "vers" be null for the current version, and not having a "current" field, which works OK only if you want the most recent version to always be the default one- which isn't your situation.)

In reply to Re: ORM with version control? by Anonymous Monk
in thread ORM with version control? by moritz

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