Counting presence of discount ranges in SQL -


i have simple orders table product being sold has column discount per order. example:

order number   discountprcnt 1234           0 1235           10 1236           41

what create output can join order table customer table , group discounts ranges email, follows:

email_address   0-20  20-50  50-100 joe@abc.com           yes    yes tom@abc.com     yes   yes

so idea determine if each customer (here designated email) has ever received discount in specified range, , if not, should return null range.

a simplified version of table structure is:

customer table:  custid   email 123      joe@abc.com 234      tom@abc.com 456      joe@abc.com

so emails can repeat across customers.

orders table: custid   orderid   amount   discprcnt 123      1234      50.00    0 234      1235      75.00    10 456      1236      20.00    41 

select c.email, count(o1.order_number),  count(o2.order_number),  count(o3.order_number) customer c, order o1, order o2, order o3 c.custid = o1.custid , c.custid = o2.custid , c.custid = o3.custid , o1.discountprcnt > 0 , o1.discountprcnt <= 20 , o2.discountprcnt > 2 , o2.discountprcnt <= 50 , o3.discountprcnt > 50 , o3.discountprcnt <= 100 group c.email

you'll not yes expected number of time user benefits discount. 0 if none.


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