$sth = $dbh->prepare("DELETE FROM $holding_table WHERE year=? AND
month=? AND day=? AND time_start=? AND time_end=? AND title=?");
$sth->bind_param(1, "$key[1]");
$sth->bind_param(2, "$key[2]");
$sth->bind_param(3, "$key[3]");
$sth->bind_param(4, "$key[4]");
$sth->bind_param(5, "$key[5]");
$sth->bind_param(6, "$key[6]");
$sth->execute();

##</code><code>##

$sth = $dbh->prepare("DELETE FROM $holding_table WHERE year=? AND
month=? AND day=? AND time_start=? AND time_end=? AND title=?");
$sth->execute( @key );