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I am writing an application and using MySQL to return the difference between 2 dates in MySQL should MySQL do this or should I actually let PHP handle it?
I also just need the sum of all the results I am getting back should I return them and add them up on the php side or is there a way to add all the results together on the MySQL Server side?
It depends somewhat on the application, but in general, I’d push it to the PHP, because normally you’re building a web site for multiple concurrent accesses; why put the calculation into the database and potentially have a bottle neck?