postgres_tables_by_size.sql

--
--  Author: Hari Sekhon
--  Date: 2020-08-05 17:54:19 +0100 (Wed, 05 Aug 2020)
--
--  vim:ts=4:sts=4:sw=4:et:filetype=sql
--
--  https://github.com/HariSekhon/SQL-scripts
--
--  License: see accompanying Hari Sekhon LICENSE file
--
--  If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
--
--  https://www.linkedin.com/in/HariSekhon
--

-- PostgreSQL tables by size, excluding catalog and information schema
--
-- Tested on PostgreSQL 8.4, 9.x, 10.x, 11.x, 12.x, 13.0

SELECT
    --nspname || '.' || relname AS relation,
    nspname,
    relname,
    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;