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

This is one of the only places where cursors are faster than a set based queries, if performance is critical I would either

• Do this outside of MySql or
• Use MySql 5 Cursors