SELECT online store discount %

["Ron Piggott" <ron.piggott@xxxxxxxxxxxxxxxxxx>]

I am trying to write a database query that determine the customer loyalty discount for an online store.  I am wondering if there is a way of doing this as 1 query, instead of multiple and using PHP to do the math?

- I want to offer a 10% discount if the person is a subscriber

SELECT 10 AS discount FROM `subscriber_details` WHERE `email` = '$client_email' LIMIT 1

- I also want to offer a customer loyalty discount: 

10% if this is a purchase within 4 months of the previous purchase, 

SELECT 10 AS discount FROM `paypal_payment_info_sample` WHERE `datecreation` >= DATE_SUB( NOW( ) , INTERVAL 4 MONTH ) AND `paymentstatus` = 'Completed' LIMIT 1

- OR 5% if the most recent previous purchase is between 4 months and 1 year ago.

SELECT 5 AS discount FROM `paypal_payment_info_sample` WHERE `datecreation` BETWEEN DATE_SUB( NOW( ) , INTERVAL 1 YEAR ) AND DATE_SUB( NOW( ) , INTERVAL 4 MONTH ) AND `paymentstatus` = 'Completed' LIMIT 1

The discounts possibilities would be:
- 20% (a subscriber with a purchase within the past 4 months)
- 15% (a subscriber with a purchase between 4 months and a year ago)
- 10% (for being a subscriber)
- 10% (for a purchase made within the past 4 months)
- 5% (for a purchase made between 4 months and a year ago)

Is there a way to do this all within the context of 1 query?

Ron

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