Question

I have a database table with user registration records. Table: [USER]
One of my columns is named created_on with type int and holds a timestamp for the registration date and time.

How should I compose my query so I can have the number of registered users for each day?

I want results like this:

21/11 : 150 users
22/11 : 200 users
23/11 : 50 users
24/11 : 150 users

Answer 1

Using FROM_UNIXTIME() and simple date functions.

SELECT MONTH(FROM_UNIXTIME(created_on)) AS "month", 
    DAY(FROM_UNIXTIME(created_on)) AS "day", COUNT(created_on)
FROM `user`
WHERE YEAR(FROM_UNIXTIME(created_on)) = 2012
GROUP BY MONTH(FROM_UNIXTIME(created_on)), DAY(FROM_UNIXTIME(created_on))

You can do your string formatting using PHP.