On 04/24/2014 04:57 PM, Tom Lane wrote: > Simon Riggs <si...@2ndquadrant.com> writes: >> On 24 April 2014 05:32, David Fetter <da...@fetter.org> wrote: >>> Since contrib/pgcrypto is a module that might well not be installed, >>> people can't just build software for PostgreSQL and have UUIDs >>> available, certainly not in the sense that, for example, BIGSERIAL is. >> +1 to include in core - strange to have a UUID datatype in core but no >> means to generate > The reason why there's no generation function in core is that there is no > standardized, guaranteed-to-produce-a-universally-unique-value generation > algorithm. That was the reason for not putting something in core when the > type was first created, and I do not see that the technology has advanced. Why can't we implement all 5 variants from http://en.wikipedia.org/wiki/Universally_unique_identifier and just warn about the dangers in documentation ?
we could expose it something like next_uuid(<version nr>); As the article points out " Since the identifiers have a finite size, it is possible for two differing items to share the same identifier." so it is a known limitation of UUID and not something PostgreSQL specific. Cheers -- Hannu Krosing PostgreSQL Consultant Performance, Scalability and High Availability 2ndQuadrant Nordic OÜ -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers