Thread: Friend class?

I have 2 classes: Database and DatabaseMgr. The functions in DatabaseMgr need to access the variables in Database. To my understanding, I can declare DatabaseMgr a friend class to Database or inherit DatabaseMgr from Database.

Code:

class Database
{
    friend class DatabaseMgr;
    public:
    /*constructors/destructors*/
  
    protected:
    /*member variables*/
};

....or

Code:

class DatabaseMgr:public Database
{
    public:
    /*functions that access the member variables of Database
};

So my question is, whats the difference? Do both methods give me the same outcome?