I have voting_IP table as follow:

+-----------+-------------+------+-----+---------+----------------+
| Field     | Type        | Null | Key | Default | Extra          |
+-----------+-------------+------+-----+---------+----------------+
| ip_id     | int(11)     | NO   | PRI | NULL    | auto_increment |
| mes_id_fk | int(11)     | YES  | MUL | NULL    |                |
| ip_add    | varchar(40) | YES  |     | NULL    |                |
| timestamp | datetime    | YES  |     | NULL    |                |
+-----------+-------------+------+-----+---------+----------------+

I want to run this query which has errors and I don't know how to correct it?

$ip_sql=mysql_query("select ip_add from Voting_IP where mes_id_fk='$id' and ip_add='$ip' and timestamp > (DATE_ADD(now(), INTERVAL -1 HOUR);)");

I also tried this one:

$ip_sql=mysql_query("select ip_add from Voting_IP where (mes_id_fk='$id' and ip_add='$ip' and timestamp > (DATE_ADD(now(), INTERVAL -1 HOUR);))");