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$where_clause = 'where id in ('.join(",",("?") x @id).')';
$sql .= $where_clause;
my $sth = $dbh->prepare($sql);
$sth->execute(@id);

$sql .= 'where id = ?';
my $sth = $dbh->prepare($sql);
...
 $sth->execute($id);
...
}