List table with counts and sizes

count.sql

SELECT nspname || '.' || relname AS "Таблиц_20_больших",
    pg_size_pretty(pg_relation_size(C.oid)) AS "Размер",
    reltuples
  FROM pg_class C
    LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
  WHERE nspname NOT IN ('pg_catalog', 'information_schema')
  ORDER BY pg_relation_size(C.oid) DESC
  LIMIT 20