not in detail, but imagine: you have code that walks a complex object graph every day to figure out how much money to move. The business rules interact in compl

not in detail, but imagine: you have code that walks a complex object graph every day to figure out how much money to move. The business rules interact in complicated ways. Do you trust that you'll always get the same value out of that system? Versus "select sum(value)" as a single query...