Please let me know what jobs are out there for a business and computer science degree?
Possible advantage: jobs where both majors are relevant. E.g. software development for applications in finance, accounting, marketing, HR, etc… Or IT.
Possible disadvantage: jobs where one but not the other is relevant. Doing the other major consumes electives that could otherwise allow you to go beyond the minimum in your primary major. Some employers may view the second major as a negative signal that you may not be fully interested in the major that is relevant to them (@HPuck35 has written about this regarding engineering and business).