public static function getLabelsFromTable(string $tableName, string $idColumnName, string $labelColumnName): array
  {
    $query = "
select `%s`  id
,      `%s`  label
from   `%s`
where   nullif(`%s`,'') is not null";

    $query = sprintf($query, $idColumnName, $labelColumnName, $tableName, $labelColumnName);

    return self::executeRows($query);
  }