Question

Editing the question.

I have SQL like this:

`table1`.`DateField` >= DATE_SUB(NOW(), INTERVAL {$days} DAY  

Now 24 hours make a whole day. However, what if I want to do the query for the last 3 hours or so?

My table1.DateField is in the format of 2010-03-10 10:05:50.

---

Original post:

If I have this

1 hour
2 hours
3 hours
..
24 hours

How would I change it to days?

Thanks.

Answer 1

MySQL not only knows DAY as a unit for an interval but also HOUR, MINUTE, ….
see http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_date-add

$x = 32;
$sql = "SELECT
   x,y,z
 FROM
   foo
 WHERE
   `table1`.`DateField` >= NOW() - INTERVAL $x HOUR
";