Database Normalization #8 – HackerRank Solution

In this post, we will solve Database Normalization #8 HackerRank Solution. This problem (Database Normalization) is a part of HackerRank Databases series.

Task

Let us take the example of a simple movie library. Each movie has a description, director, and serial number. Customers have a name, address, and membership number. Assume only one copy of each movie exists in the library. We are given the following relations and determinants. The keys for each relation are CAPITALIZED.

Relations (The key is CAPITALIZED):
customer(name,addr,MEMBERNO)
movie(DESCRIPTION,director,serialno)
borrow(memberno,DATE,SERIALNO)

Which of these determinants is a NON-KEY dependency? In the text box, only enter the index number (1-6) of the dependency which you have identified as non-key.

1.  description->director,serialno
2.  serialno->description
3.  serialno->director
4.  name,addr -> memberno
5.  memberno -> name,addr
6.  serialno,date -> memberno

Output Format

In the text box, only enter the index number (1-6) of the dependency which you have identified as non-key.

Solution – Database Normalization #8 – HackerRank Solution

3

Note: This problem (Database Normalization #8) is generated by HackerRank but the solution is provided by CodingBroz. This tutorial is only for Educational and Learning purpose.