Question

I have date time field called transaction_date, in a report i need to select last calendar month, how do i do this ? (this should work for a month like January too)

I came up with following but this only works if the month is NOT january,

SELECT SUM(amount)  AS pay_month FROM `users_payment`  WHERE  MONTH(transaction_datetime)= MONTH(NOW()) AND YEAR(transaction_datetime)=YEAR(NOW())

there are lot of examples using INTERVAL functions but this only select the time interval not the calendar month as i wanted too..

like

SELECT SUM(amount)  AS `year_month` FROM `users_payment`   WHERE  DATE_ADD(NOW(), INTERVAL -1 MONTH) < transaction_datetime 

but this is not what i want, i want to select sales sum of the DECEMBER only last year (remember there are other years too in the table which i dont want i.e 1979, 1981…etc)

same report next section, i need to select last 2 calender months, I dont know have any idea on how to do this too.

Answer 1

Have you tried the following

SELECT SUM(amount)  AS `year_month` FROM `users_payment`
WHERE MONTH(DATE_ADD(NOW(), INTERVAL -1 MONTH)) = MONTH(transaction_datetime)

The above should work to show previous month; it does not distinguish between years however.

On second thought, I see what you are trying to do – To get all the transactions for a given month. Try something like this instead.

SELECT SUM(amount)  AS `year_month` FROM `users_payment`
WHERE transaction_datetime BETWEEN date_format(NOW() - INTERVAL 1 MONTH, '%Y-%m-01')
   AND last_day(NOW() - INTERVAL 1 MONTH)

This will list all the transactions for the previous calendar month. Alter the INTERVAL values to select multiple months.