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  1. or download this
    my $query = sprintf('SELECT recno, body FROM body WHERE recno IN (%s)'
+, join ',', map {$_ = '?'} @recnos);
...
$sth->execute(@recnos);
  2. or download this
    my $query = sprintf('SELECT recno, body FROM body WHERE recno IN (%s)'
+, join ',', ('?') x @recnos);
...
$sth->execute(@recnos);