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  1. or download this
    my $sql = qq{
    SELECT COUNT(*)
      FROM some_table
     WHERE some_column IN (} . join(',', (('?') x @values)) . ")";
    
  2. or download this
    my $sql = <<END_SQL;
    SELECT COUNT(*)
      FROM some_table
    ...
        while ($sth->fetch) 
        {
         # etc.