Also, what is `average quantity sold`? What are the units? Containers per Fortnight? Shots per second (I imbibe expeditiously)? Your SQL probably does not work because you cannot define the problem, so lets start there.
Also, what is `average quantity sold`? What are the units? Containers per Fortnight? Shots per second (I imbibe expeditiously)? Your SQL probably does not work because you cannot define the problem, so lets start there.