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  1. or download this
      my $find_book = $dbh->prepare(qq{
     SELECT title FROM book WHERE isbn = ?
  });
  2. or download this
     my $isbn = "156884915X";
 my $title = $dbh->selectrow_array($find_book, undef, $isbn);
  3. or download this
     my $isbn = 1565922433;
 my $title = $dbh->selectrow_array($find_book, undef, $isbn);