select from mysql table between datetime x min ago and datetime x min ago

Question

I think I summed nicely it up in the title. I want to select online users from a specific time to another specific time. My table look like this:

CREATE TABLE on         


        

Answer 1

Use DATE_SUB to subtract time from the DATETIME returned from NOW():

last 15 minutes

SELECT o.*
  FROM ONLINE o
 WHERE o.time >= DATE_SUB(NOW(), INTERVAL 15 MINUTE) 

last 60 minutes, but not the last 15 minutes

SELECT o.*
  FROM ONLINE o
 WHERE o.time BETWEEN DATE_SUB(NOW(), INTERVAL 60 MINUTE) 
                  AND DATE_SUB(NOW(), INTERVAL 15 MINUTE) 

Duplicate handling costs extra.