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.
The answer to this question is: coding and testing
Extreme programming is a software development methodology that aim to improve software quality by measuring whether the technology can be used to fulfill customer's requirement.
To actually get somethings that is accepted by the customers, various coding and testing the software will be done constantly
Hi!
The 2016 Olympics took place from August 5th, 2016 - August 21st, 2016.
