Clarification question - Mailing list pgsql-general

Is the following select sufficient and correct for extracting the column
names of a table, excluding all system columns?

select attname from pg_attribute
   where attrelid=
      (select relfilenode from pg_class
          where relname like <insert table name here>)
      and attnum > 0

I want to be certain that no system columns are returned, only columns I've
created.

Am I overlooking anything?

Thanks!

Tim Barnard
S.E. Mgr
Hartford Communications Corporation