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Database Normalization in SQL

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Questions and Answers

What is the purpose of Normalization in SQL?

To increase data redundancy and improve data retrieval

To complicate database design for better performance

To create undesirable characteristics like Insertion, Update and Deletion Anomalies

To eliminate redundant data and ensure logical data storage (correct)

What is the purpose of a composite key in a database?

To store data illogically

To increase redundancy in the database

To uniquely identify a database record using multiple columns (correct)

To complicate data retrieval from the database

In which normal form does normalization achieve its best in most practical applications?

1st Normal Form

4th Normal Form

3rd Normal Form (correct)

2nd Normal Form

Who proposed the theory of normalization of data with the introduction of First Normal Form?

<p>Edgar Codd</p> Signup and view all the answers

1

<p>It has following attributes</p> Signup and view all the answers

Study Notes

Normalization in SQL

Normalization in SQL is used to minimize data redundancy and dependency by organizing fields and tables to minimize data redundancy and dependency.

Composite Key in a Database

A composite key in a database is a primary key composed of more than one attribute (column) that uniquely identifies a record in a table.

Best Normalization in Practical Applications

Normalization achieves its best in 3NF (Third Normal Form) in most practical applications.

Theory of Normalization

Edgar F. Codd proposed the theory of normalization of data with the introduction of First Normal Form (1NF).

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Description

Learn about database normalization in SQL and the concepts of 1NF, 2NF, and 3NF with examples. Understand how normalization reduces data redundancy and eliminates anomalies in a database design.