how to fetch the data according to particular month & year in mysql php

Question

Ok, i have a database in which i have all my users registered with their datetime which stores in my MYSQL datetime field as 2012-03-31 12:13:42 now i want to fetch COUNT of users according to year and month .

As i want to present a chart data for that purpose, i want total customers added in January , in feb , march and so on.... in particular year.

ie it has to be year specific that in 2010 Jan lets say 52 Customers in 2010 Feb lets say 72 Customers .

Note : The query i want to execute is using PHP and Mysql.

Answer 1

You can use the MySQL date functions

SELECT YEAR(date_field) as stat_year,
       MONTH(date_field) as stat_month,
       COUNT(*) as stat_count
FROM `table`
GROUP BY stat_year,stat_month

If you only want the results for a specific year/month, you can add conditions to the WHERE clause (and remove the GROUP BY) like this

SELECT COUNT(*) as stat_count
FROM `table`
WHERE YEAR(date_field) = 2012
  AND MONTH(date_field) = 3

Answer 2

There are different SQL that will do the trick, here is one ...

SELECT COUNT(dt), DATE_FORMAT(dt, '%Y-%b') AS df FROM foo GROUP BY df;

where foo is your table name, and dt is the datetime column. Note that this will apply the function DATE_FORMAT on each row. Also, you can change the format as desired, eg use %m for numeric month, %M for full month name, etc. Add in where clause to filter as needed. The following SQL is almost the same ...

SELECT COUNT(dt), YEAR(dt) AS y, MONTH(dt) AS m FROM foo GROUP BY y, m;