Question

For example I have a table that has the number of people in a room at a given time

room_color    people    time
red           100       2012-07-13 11:11:11
red           120       2012-07-13 11:14:12
red           130       2012-07-13 11:17:13
green         ... etc

How do I find the average amount of people in the room in a 10 minute interval, for example to summarize the amount of people in the red room at 11:10 to be ~117

I know some ways to do this but it all involves creating a new table, how do I do this without creating a new table? I simply want to delete irrelevant data.

Answer 1

Insert into room (room_color, people)
( Select color, avg(people) as people from room 
where time between '2012-07-13 11:10' and '2012-07-13 11:20'
Group by room_color )

Delete From room where time between '2012-07-13 11:10' and '2012-07-13 11:20'

-- in case of need set some time to the table
update room set time = '2012-07-13 11:10' Where time is null

Try this, if you want you may use two datetime variables and add to one 10 minutes. using the variables in the between clause.

hope this helps.