Someone hasn't used Postgres. http://www.postgresql.org/docs/9.1/static/datatype-uuid.html http://www.postgresql.org/docs/9.1/static/datatype-uuid.html And any

Someone hasn't used Postgres. http://www.postgresql.org/docs/9.1/static/datatype-uuid.html http://www.postgresql.org/docs/9.1/static/datatype-uuid.html And anyway, all a UUID is, ultimately, is a big number. It's a simple transcoding to get it into base-10 integer format and back.