The world is going increasingly mobile. According to ZDNet contributor Matt Baxter-Reynolds, the mobile Web is dead. Native apps have taken over as the preferred means of Web connection for countless Internet users, and companies that require these apps are taking notice. According to Robert Half Technology's 2014 IT Salary Guide, Web developers will be one of the most in-demand professions of the next new year, and they will need to be trained in development tools like SQL.
When performing intense calculations, an obvious language choice is C or C++. However, PL/SQL is a natural choice for logic that interacts heavily with database data. If all you need to do is add or multiply a few large numbers, there's no reason you can't leverage the appropriate algorithms to perform the arithmetic in PL/SQL and still get good performance.