How to determine what elements are in your enum   

This question was asked on the PostgreSQL novice newsgroup recently and Tom Lane fielded the question. Its a common thing to want to know if you are using the new 8.3 Enum feature. So we felt it useful to restate it.

Question: Given an enum, is there a query you can run to list out all the elements allowed by the enum?

Answer: Yes.

CREATE TYPE myenum as enum ('red','green','blue');
SELECT enumlabel 
   FROM pg_enum 
   WHERE enumtypid = 'myenum'::regtype 
   ORDER BY oid;

 enumlabel
-----------
 red
 green
 blue
(3 rows)

http://www.postgresql.org/docs/8.3/static/catalog-pg-enum.html