PL/PgSQL for counting all rows in all tables.

Folks,

I've noticed that when coming into an organization, I need to do some
counting on what's in all the tables in a db. This shortens that
process considerably, with the usual caveat that count(*) is a heavy
operation.

By the way, the 3 lines following "godawful hack" point to something
PL/PgSQL ought (imho) to be able to do, namely something like

EXECUTE INTO [ record | rowtype | type ] [sql TEXT string returning a single row];

Here 'tis: version 0.01...

CREATE TYPE table_count AS (table_name TEXT, num_rows INTEGER);

CREATE OR REPLACE FUNCTION count_em_all () RETURNS SETOF table_count
AS '
DECLARE
the_count RECORD;
t_name RECORD;
r table_count%ROWTYPE;
BEGIN
FOR t_name IN
SELECT c.relname
FROM
pg_catalog.pg_class c
LEFT JOIN
pg_namespace n
ON
n.oid = c.relnamespace
WHERE
c.relkind = ''r''
AND
n.nspname = ''public''
ORDER BY 1
LOOP
-- The next 3 lines are a godawful hack. :P
FOR the_count IN EXECUTE ''SELECT COUNT(*) AS "count" FROM '' || t_name.relname
LOOP
END LOOP;
r.table_name := t_name.relname;
r.num_rows := the_count.count;
RETURN NEXT r;
END LOOP;
RETURN;
END;
' LANGUAGE plpgsql;

COMMENT ON FUNCTION count_em_all () IS 'Spits out all tables in the public schema and the exact row counts for each.';

--
David Fetter david(at)fetter(dot)org http://fetter.org/
phone: +1 510 893 6100 mobile: +1 415 235 3778

Remember to vote!

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My version:

ANALYZE;

SELECT n.nspname, relname, reltuples
FROM pg_class c, pg_namespace n
WHERE c.relnamespace=n.oid
AND relkind='r'
AND NOT n.nspname ~ '^pg_'
ORDER BY 1,2;


- --
Greg Sabino Mullane greg(at)turnstep(dot)com
PGP Key: 0x14964AC8 200409282138

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