postgres_tables_row_estimates.sql

--
--  Author: Hari Sekhon
--  Date: 2020-08-05 18:21:15 +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 table row count estimates in one place
--
-- Useful when comparing tables or when a table becomes so large you don't want the expense
-- of 'SELECT COUNT(*)' and are happy to use the internal statistics instead
--
-- Tested on PostgreSQL 8.4, 9.x, 10.x, 11.x, 12.x, 13.0

SELECT
    schemaname,
    relname,
    n_live_tup
FROM
    --pg_stat_all_tables
    pg_stat_user_tables
ORDER BY
    n_live_tup DESC;