Calculate a running total in MySQL

Question

I have this MySQL query:

SELECT DAYOFYEAR(`date`)  AS d, COUNT(*) 
FROM  `orders` 
WHERE  `hasPaid` > 0
GROUP  BY d
ORDER  BY d

Which re

Answer 1

Unless you have no other option but doing this in sql, I'd sum the results in the programming language that is making the query. A nesting like this will became very slow as the table grows.