This is called a key attribute!
There are different types of key attributes!
Primary key is the key that is actually chosen, for example a social security number.
There is also a unique key, say our finger prints! they also uniquely identify humans, but usually we prefer to use social security number when we list people (a unique key could be a primary key if we chose so)
We could also identify people by their social security number and a name, but this is unnecessary, as social security number already gives a full identification. Such a reduntant key is called super key.
Look. You need to stop your watch at 00:00. And then you'll see that its least count is 0.01 second and then you should add your clocks' response time to make results more accurate.
3. A, (first choice)
4. C (Third choice from top)
Answer:
can only be carried out by computers, as long as an interpreter is available which one is it?
Explanation:
The interperetor needed is called CPython, this is the standard C implementation of the language.
