I have a table that tracks users' performance in various categories of questions as they take a quiz. 5 questions are drawn randomly from 3 different question categories X, Y and Z. A score is calculated for each user in each category based on how many correct answers he got in that category.
How can I calculate cumulative sums for CorrectAnswers and QuestionsAnswered by date, by user and by question category? I want to use the cumulative sums to caculate a cumulative score. That part is easy. It's the cumulative sums that I'm struggling with. This is the end result I'm looking for.
