Question

I’m back with another mysql query question. This time, given a time range, I need to select the date of the last order of a customer AND the total number of order that customer placed within that time range.

The (stripped) query goes like this:

SELECT 
   customers_id, 
   customers_name, 
   date_purchased, 
   count(*) as total_order 
FROM orders 
GROUP BY customers_id;

Obviously the date_purchased returned there is not of the LAST order of the customer within the time range, but I can’t order before group by, is there anyway to get around this? For example should I order first, then group by (nested selects)?

Answer 1

select customers_id,
       customers_name,
       MAX(date_purchased) as last_purchase,
       count(*) as total_order
from orders
group by customers_id,customers_name;