Morgan Stanley Interview Question

With C++: What functions are automatically provided when you create a class? How would you define the function signatures if you wanted to define them? When would you use a pointer vs. a reference? What is the difference between pass by reference and pass by value? Given a table with columns: user | start_date | end_date | code How would you find an entry for a user with start_date=A and end_date=B, and insert if it doesn't exist?