On Thursday, July 2, 2020, Mitar <mmi...@gmail.com> wrote:

> make queries asking for
> results at the particular historical version of table state?


Even for a single table how would you go about specifying this in a
user-friendly way?  Then consider joins.


> Is this something I would have to run a custom version of PostgreSQL
> or is this possible through an extension of sort?
>

 If by “this” you mean leveraging MVCC you don’t; it isn’t suitable for
persistent temporal data.

The fundamental missing piece is that there is no concept of timestamp in
MVCC. Plus, wrap-around and freezing aren’t just nice-to-have features.

David J.

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