On Thu, 14 Sep 2017 09:45:59 +0200, Rafal Pietrak <rafal(at)ztk-rp(dot)eu>
wrote:
>Hello everybody,
>
>Can anybody help me find a way to implement an ID which:
>
>1. guarantees being unique across multiple tables.
>
>2. guarantees its uniqueness not only during INSERT, but also during the
>lifetime of the database/application (e.i. during future UPDATES).
>
>3. guarantees persistence of value across database backup/restore/upgrade.
UUID is the obvious choice, but it does take a lot of space.
Something like this might do the job:
http://rob.conery.io/2014/05/28/a-better-id-generator-for-postgresql/
George