True. The "logic" behind how sending and requesting data between a database is essentially the same. But, the method in which you perform that logic is not. For example, php and C# are different. Even if you use PHP, from what I understand, you still need to use C# in order to connect that PHP script to Unity. So, although the logic is the same, it's not entirely identical and it's absurd to think, just because you know one method of doing it, you automatically know all methods of doing it (as some people here seem to think).