How to add values in mySQL together with PHP

Question

I need to add values in MySQL and see if its greater than another value then echo the amount of rows.

$result = mysql_query("SELECT created_at,seconds FROM table WHERE created_at + seconds > CURTIME()");
$num_rows = mysql_num_rows($result);
echo $num_rows;

Answer 1

If seconds is an integer column, use DATE_ADD :

SELECT created_at, seconds FROM table
WHERE DATE_ADD(created_at, INTERVAL seconds SECOND) > CURTIME()