Postgres table sizes

.sql

-- https://wiki.postgresql.org/wiki/Disk_Usage
-- This version of the query uses pg_total_relation_size, which sums total disk space used by the table including indexes and toasted data rather than breaking out the individual pieces:

SELECT nspname || '.' || relname AS "relation",
    pg_size_pretty(pg_total_relation_size(C.oid)) AS "total_size"
  FROM pg_class C
  LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
  WHERE nspname NOT IN ('pg_catalog', 'information_schema')
    AND C.relkind <> 'i'
    AND nspname !~ '^pg_toast'
  ORDER BY pg_total_relation_size(C.oid) DESC
  LIMIT 20;