Question

Using the following query to select data from a table in 15 minute intervals where a point has state=1:

SELECT * , ROUND( UNIX_TIMESTAMP( log_date ) / ( 15 *60 ) ) AS period
FROM  `site_node_point_states` 
WHERE state =1
AND site_node_point_id =  "11"
AND log_date
BETWEEN  '2011-09-12 13:00:00'
AND  '2011-09-12 13:00:00'
GROUP BY period
ORDER BY period ASC

This query does exactly what I want based on a single site_node_point_id, however I would like to be able to add another site_node_point_id and have that grouped by period individually of the other site_node_point_id data.

I am using PHP to make this query, and would like to try and limit it to a single query rather than looping through my current one with a different site_node_point_id.

Obviously If I were to change AND site_node_point_id = "11" to AND site_node_point_id = "11" OR site_node_point_id = "14" it would order data from both site_node_point_id 14 and 11.

Is there a solution in SQL to do the GROUP BY individually for each set of data based on the site_node_point_id that I am selecting?

Answer 1

Use GROUP BY site_node_point_id, period. That should group your results first by site_node_point_id, then period.