- my $sth = $dbh->prepare('SELECT '.$tclass->primary_key.' FROM '.$table.' ORDER BY '.$tclass->primary_key.' LIMIT '.$step.' OFFSET '.$$offset) or die $dbh->errstr;
+ my $sth = $dbh->prepare(
+ 'SELECT '.$tclass->primary_key.
+ ' FROM '.$table.
+ " WHERE ( is_tokenized IS NULL OR is_tokenized = '' ) ".