SELECT nspname||'.'||relname AS full_rel_name
  FROM pg_class, pg_namespace
 WHERE relnamespace = pg_namespace.oid
   AND nspname = 'yourschemaname'
   AND relkind = 'r';

SELECT table_schema||'.'||table_name AS full_rel_name
  FROM information_schema.tables
 WHERE table_schema = 'yourschemaname';

SELECT * FROM pg_catalog.pg_tables where schemaname="yourschemaname";