The ability to modify a scheme definition in one level without affecting a scheme definition in a higher level is called data independence.


There are two kinds:

Physical data independence

The ability to modify the physical scheme without causing application programs to be rewritten
Modifications at this level are usually to improve performance
Logical data … Read more

The ability to modify a scheme definition in one level without affecting a scheme definition in a higher level is called data independence.


There are two kinds:

Physical data independence

The ability to modify the physical scheme without causing application programs to be rewritten
Modifications at this level are usually to improve performance
Logical data … Read more

There's a browser add-on called TinEye which allows you to do a reverse image search. It will find any other instances of the same image on the Web and, from that, you may be able to decide which is the original