PostgreSQL: How to count rows in tables

row_count.sql

DO $$
DECLARE
    r RECORD;
    row_count BIGINT;
BEGIN
    FOR r IN (SELECT relname FROM pg_stat_user_tables) LOOP
        EXECUTE 'SELECT COUNT(*) FROM ' || quote_ident(r.relname) INTO row_count;
        RAISE NOTICE 'Table: %, Row count: %', r.relname, row_count;
    END LOOP;
END $$;