Obtain postgres length tables

postgres_tables_length.sql

 SELECT
   *,
   pg_size_pretty(total_bytes) AS total,
   pg_size_pretty(index_bytes) AS INDEX,
   pg_size_pretty(toast_bytes) AS toast,
   pg_size_pretty(table_bytes) AS TABLE
 FROM (
        SELECT
          *,
          total_bytes - index_bytes - COALESCE(toast_bytes, 0) AS table_bytes
        FROM (
               SELECT
                 c.oid,
                 nspname                               AS table_schema,
                 relname                               AS TABLE_NAME,
                 c.reltuples                           AS row_estimate,
                 pg_total_relation_size(c.oid)         AS total_bytes,
                 pg_indexes_size(c.oid)                AS index_bytes,
                 pg_total_relation_size(reltoastrelid) AS toast_bytes
               FROM pg_class c
                 LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
               WHERE relkind = 'r'
             ) a
      ) a;