Below link is from rapidprogramming.com. Below list is still valid, even though Oracle owns MySQL (indirectly by acquiring Sun)! Oracle is currently committed to keeping the open source nature and the difference, but future versions you may see it come much closer to Oracle database, so don’t be surprised, if some of these differences disappear!!
Oracle is the leading database management system released by Oracle Corporation. MySQL is a database management system sponsored by a company named MySQL AB.