Answer:
Explanation:
Duplicate tuples are not allowed in a relation because the specifications of the constraints of the regional integrity are violated, especially the main constraint that states that there can be no identical values for the attributes of two tuples at any database relation state.
Also, duplicate tuples are not allowed in a relation due to the fact that they lead to redundancy of the data base which in turn, slowing down the speed of the database when data processing such as inserting, querying, updating, deleting, etc are being performed.
Answer:
Scanner can be used to read tokens from the console window (user input)
Explanation:
Scanner is a class used in some programming languages to obtain inputs from users.
It is mostly well developed in Java programming language and used exclusively for taking and obtaining inputs.
Scanner takes input in primitive types such as doubles, floats and integers. IT also takes string inputs.
Here is a code snippet where the class scanner is used:
Scanner input = new Scanner (System.in)
The code above creates an object of the scanner class
Answer: CPUs
Hope it helps :) and let me know if you want me to elaborate.
