Query for the effort assigned to an individual or role on a user story or task

I am trying to run a query that will tell me the effort for each individual assigned to a user story or task. For example, I have a user story and have assigned a developer and a qa person. I want to know the amount of effort for each. I can get the Role and the GeneralUser but I can't figure out how to get the assigned effort. I can get the total effort but that is not what I need as I need to cost based on the role or individual.