postgres_tables_by_size_2.sql

--
--  Author: Hari Sekhon
--  Date: 2022-05-18 18:06:53 +0100 (Wed, 18 May 2022)
--
--  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
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--  https://www.linkedin.com/in/HariSekhon
--

-- PostgreSQL tables by size
--
-- Tested on PostgreSQL 8.4, 9.x, 10.x, 11.x, 12.x, 13.0

SELECT
    schemaname AS table_schema,
    relname AS TABLE_NAME,
    pg_size_pretty(pg_total_relation_size(relid)) AS total_size,
    pg_size_pretty(pg_relation_size(relid)) AS data_size,
    pg_size_pretty(pg_total_relation_size(relid) - pg_relation_size(relid)) AS external_size
FROM
    pg_catalog.pg_statio_user_tables
ORDER BY
    pg_total_relation_size(relid) DESC,
    pg_relation_size(relid) DESC;