Sequence element F4 error for query

[sunnyjey]

If I place any code to return in placeholder Query field in sequence field, I am getting

$words = preg_split('/\s+/', '{mytable___name}');
$acronym = "";
foreach ($words as $w) {
    $acronym .= $w[0];
}
return $acronym;

OR just

return '2';

I am getting following error:
You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use

J4 F4 latest

 

[troester]

I'm not on my PC but I think you must use SQL, not PHP