CREATE or REPLACE FUNCTION "sys_guid"()
RETURNS "pg_catalog"."varchar" AS $BODY$
DECLARE v_seed_value varchar(32);
BEGIN
select
md5(
inet_client_addr()::varchar ||timeofday() ||
inet_server_addr()::varchar ||to_hex(inet_client_port())
)
into v_seed_value;
return upper((substr(v_seed_value,1,8) ||
substr(v_seed_value,9,4) ||
substr(v_seed_value,13,4) ||
substr(v_seed_value,17,4) ||
substr(v_seed_value,21,12)));
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE SECURITY DEFINER;