Question

I am trying to find the sum of values between two dates in this case I would always want to keep one date static. Example finding the value between dates April to July, keeping April static, so therefore another case could be sum of values between dates April to May, again keeping april static. I have been working on several queries for quite sometime but havn’t been sucessful in doing so could you have a look at the following SQLFiddle here and aid me please I would really appreciate the help

Answer 1

Why not just add another CASE statement:

sum(case when pay_date between '2012-04-01' and '2012-06-01'
        then amount end) range_amount

so your query would be:

SELECT p.name,
       v.v_name,
       SUM(CASE
             WHEN MONTH(py.pay_date) = 4 THEN amount
           end) april_amount,
       SUM(CASE
             WHEN MONTH(py.pay_date) = MONTH(CURDATE()) THEN amount
           end) current_month_amount,
       SUM(CASE
             WHEN MONTH(py.pay_date) = MONTH(CURDATE()) - 1 THEN amount
           end) previous_month_amount,
       SUM(CASE
             WHEN pay_date BETWEEN '2012-04-01' AND '2012-06-01' THEN amount
           end) range_amount
FROM   persons p
       LEFT JOIN vehicle v
              ON p.id = v.person_veh
       LEFT JOIN payment py
              ON p.id = py.person_id
GROUP  BY p.name,
          v.v_name

see SQL Fiddle with Demo

Then if you want to change the date range, you can pass in a value for the end date and make that a variable.