Get result in 15 minutes interval in mysql [closed]

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is there way where I can get the values of the day but in a 15 minutes interval, how should I do it? I'd want the result to look something like this:

+--------------------+-------+
| Date/Time          | Value |
+--------------------+-------+
| 2014-01-01 8:00:10 |  10   |
| 2014-01-01 8:15:05 |  11   |
| 2014-01-01 8:30:04 |  24   | 
+--------------------+-------+

I was using this query but this gets the data for every hour and now i need the 15 min interval

SELECT x.* 
 FROM my_table x 
 JOIN 
    ( SELECT MAX(dt) max_dt 
        FROM my_table 
       GROUP BY DATE(dt),HOUR(dt)
    ) y
   ON y.max_dt = x.dt;

Answer 1

Classify your timestamps by which portion of the hour they fall into (using integer division) then group by that classification. So your inner query will look like:

SELECT MAX(dt) max_dt
FROM   my_table
GROUP  BY DATE(dt), HOUR(dt), MINUTE(dt) DIV 15