Normalisation can be regarded as the most basic as well as the most essential part of a database designing, a database designer must have a good understanding of semantics of data, in order to build an efficient design which can be achieved by using the concept of normalisation.
There are several purposes of normalisations which are given below:-
Normalisation is achieved in various forms which are described as:
Various types of ANOMALIES which are there in a relation when normalisation is not achieved are:
For example:
let there be a relation of "invoice of a book company" having some relations as
Insertion anomaly:
In relation 2, data of new book can only be added when a customer buys a book, no DATA of new book can be added when a book is published thus data is added only when customer buys a book.
Deletion anomaly:
In relation 2, if a book is purchased by only one customer then the book data will be lost when we delete that record after fully satisfying that customer order
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Q1: Define normalization in DBMS. Explain with examples two possible anomalies in a relational database tables...
What is the purpose of conducting normalization to a relational database? Use examples to explain your answer.
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