Siddharth Saha <siddharthsaha@drishti-soft.com> writes:
> How can you determine the number of user defined types. Does the pg_type
> table has some entry which indicates that it is a user defined type and not
> a pre-defined one?
There isn't any hard and fast distinction betweem built-in and
user-defined types.
Depending on what you're doing, you might want to consider a type
"built-in" if it resides in the pg_catalog or information_schema
schemas (I think this is the definition psql's \dT uses). Or you
could check whether the type's OID is less than 16384, which would
tell you whether it was created during initdb.
regards, tom lane
