On Fri, Mar 11, 2016 at 4:19 PM, Elein <el...@varlena.com> wrote: > An unused (yet) enum type cannot display the enum ranges. An empty table > containing that type cannot display enum ranges. >
Yes, it can. CREATE TYPE rainbow AS enum ('red','orange','yellow','blue','purple'); SELECT enum_range(null::rainbow); enum_range {red,orange,yellow,blue,purple} I get the distinction between classes and objects. But in many cases, like this one, you need to obtain an instance of a class - a null is generally sufficient - and pass that instance to a function. The function can then use "pg_typeof(instance_value)::oid" to derive the oid for the corresponding class. This is a common idiom in PostgreSQL. The only improvement, besides the error handling point, that I see to be had here is your understanding of how the system works. David J.