$res = XDB::iterRow("SELECT s.id, s.{$this->text_field}, i.level
FROM profile_{$this->table}_enum AS s
INNER JOIN profile_{$this->table}s AS i ON(s.id = i.{$this->skill_field})
$res = XDB::iterRow("SELECT s.id, s.{$this->text_field}, i.level
FROM profile_{$this->table}_enum AS s
INNER JOIN profile_{$this->table}s AS i ON(s.id = i.{$this->skill_field})