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  1. or download this
    my $sth = $dbh->prepare(q{
   SELECT x, y, z FROM table1, table2
   WHERE x = ?, y = ?
   ORDER BY z
});
  2. or download this
    $dbh->do('delete from temp where x = ?', undef, $x);
  3. or download this
    $sth->execute;
$sth->bind_column(\$res);
$sth->fetch;
  4. or download this
    $sth->execute;
unless (@cols = $sth->fetchrow_array) {
   # error
}