List stored functions that reference a table in PostgreSQL

Question

Just a quick and simple question: in PostgreSQL, how do you list the names of all stored functions/stored procedures using a table using just a SELECT statement, if possible

Answer 1

Same as @quassnoi and @davidwhthomas, except I added the argument names in there:

SELECT  proname, proargnames, prosrc 
FROM    pg_catalog.pg_namespace n
JOIN    pg_catalog.pg_proc p
ON      pronamespace = n.oid
WHERE   nspname = 'public';

If the purpose behind listing the functions is to clean them up or iterate a new function with a changing params list, you will frequently need to drop functions:

DROP FUNCTION ();

By adding proargnames, I am able to construct the applicable function name for the drop.

Additionally, it's nice to see a more complete picture when evaluating the functions.