MySQL - select data from database between two dates

Question

I have saved the dates of a user\'s registration as a datetime, so that\'s for instance 2011-12-06 10:45:36. I have run this query and I expected this item

Answer 1

You need to use '2011-12-07' as the end point as a date without a time default to time 00:00:00.

So what you have actually written is interpreted as:

 SELECT users.* 
 FROM   users
 WHERE  created_at >= '2011-12-01 00:00:00' 
   AND  created_at <= '2011-12-06 00:00:00'

And your time stamp is: 2011-12-06 10:45:36 which is not between those points.
Change this too:

 SELECT users.* 
 FROM   users
 WHERE  created_at >= '2011-12-01'  -- Implied 00:00:00
   AND  created_at <  '2011-12-07'  -- Implied 00:00:00 and smaller than 
                                   --                  thus any time on 06