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

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