/* dqfile can not */
/* hybridfile can not - missing langver support */
USE plato;

$a = (SELECT Max(Input.key || Input2.subkey) FROM Input JOIN Input2 ON Input.subkey = Input2.key);

$b = "1" || (SELECT Max(Input.key || Input2.subkey) FROM Input JOIN Input2 ON Input.subkey = Input2.key);

$c = (SELECT Max(Input.key || Input2.subkey) FROM Input JOIN Input2 ON Input.subkey = Input2.key) || "1";

$d = "1" || (SELECT Max(Input.key || Input2.subkey) FROM Input JOIN Input2 ON Input.subkey = Input2.key) || "1";

SELECT $a, $b, $c, $d;