Database Normalization 1NF 2NF 3NF | What is Normalisation in SQL | Normalisation Form | Simplilearn

Aug 19, 20240 likes138 views

In this video on Database Normalization 1NF 2NF & 3NF .We'll explore the fundamental concepts and techniques used to organize data efficiently within a database. Normalization is a crucial process in database design that helps reduce data redundancy, ensures data integrity, and simplifies data management.Throughout this tutorial, we'll take you step by step through the various Normal Forms, from the First Normal Form (1NF) to the Fifth Normal Form (5NF), including the Boyce-Codd Normal Form (BCNF). Each section will provide clear explanations and practical examples to help you understand how to apply these rules in real-world scenarios.

Database Normalization 1NF 2NF 3NF | What is Normalisation in SQL | Normalisation Form | Simplilearn

What is Normalization ?
Normalization
Normalization in DBMS is a method used
to organize data within database tables to
reduce repetition

What is Normalization ?
Before Normalization

What is Normalization ?
Normalized Customer Table
Normalized Order Table

Advantages of Normalization
Reducing Data Redundancy
Consistency
Reducing Risk of Errors
Maintaining Data Integrity

Types of Normal Forms
For a Table to be in 1st
Normal Form it has to satisfy
these rules
Atomic Attributes Same Domain Values
Unique Column Names
Order of Data Doesn't Matter
1st
Normal Form

Types of Normal Forms
For a table to be in the Second Normal Form (2NF), it must
satisfy the following conditions
It must be in 1NF No Transitive Dependency
2nd
Normal Form

Order Table
Products Table
Types of Normal Forms

Types of Normal Forms
For a Table to be in 3rd
Normal Form (3NF) it has to
satisfy these rules
It must be in 2NF
There should be no transitive
dependency
3rd
Normal Form

Types of Normal Forms
For a table to be in the Third Normal Form (3NF), it must satisfy
the following conditions
It must be in 2NF No Transitive Dependency
2nd
Normal Form

Students Table
Courses Table
Types of Normal Forms

Types of Normal Forms
For a Table to be in BCBNF it has to satisfy these rules
It should be in 3NF For every functional dependency `(A B)`
→
A should be a superkey
Boyce-Codd Normal Form

Employees Table
Department Table
Types of Normal Forms

Types of Normal Forms
For a Table to be in 4h Normal Form it has to satisfy
these rules
It should be in BCNF No multi-valued dependencies.
4th
Normal Form

Employees Skill Table
Employee Project Table
Types of Normal Forms

Types of Normal Forms
For a Table to be in 5th
Normal Form it has to satisfy
these rules
Cannot be decomposed into
any smaller tables
5th
Normal Form
It should be in 4NF

Suppliers Parts Table
Supplier Project Table
Types of Normal Forms

Parts Project Table
Types of Normal Forms

Normalization is a process used to organize data in a database. It involves breaking tables into smaller, more manageable pieces to reduce data redundancy and incorrect outputs. There are several forms of normalization including first normal form (1NF), second normal form (2NF), third normal form (3NF), Boyce-Codd normal form (BCNF), fourth normal form (4NF), and fifth normal form (5NF). Each form addresses different types of dependencies and anomalies to structure data in its most optimal format.

Normalization in DBMSPrateek Parimal

Normalization is a process used to organize data in a database. It involves breaking tables into smaller, more manageable pieces to reduce data redundancy and improve data integrity. There are several normal forms including 1NF, 2NF, 3NF, BCNF, 4NF and 5NF. The document provides examples of tables and how they can be decomposed into different normal forms to eliminate anomalies and redundancy through the creation of additional tables and establishing primary keys.

Database Normalization.pptxGreen University of Bangladesh

The document discusses different levels of database normalization including first normal form (1NF), second normal form (2NF), third normal form (3NF), Boyce-Codd normal form (BCNF), fourth normal form (4NF), and fifth normal form (5NF). Normalization is a technique to reduce data redundancy and eliminate anomalies by organizing attributes and relations. The document provides definitions and requirements for each normalization form with the goal of most databases being at least 3NF or BCNF.

NormalizationAltafsoomro

Normalization in databasesbaabtra.com - No. 1 supplier of quality freshers

Normalization in relational database management systemsPreethi T G

The document discusses database normalization. Normalization is the process of organizing data to avoid data redundancy and inconsistencies. It involves splitting tables and rejoining them through relationships. There are several normal forms that data can be organized into from 1st normal form to 5th normal form, each addressing different types of dependencies and relationships to minimize data anomalies. The goal of normalization is to organize data to reduce storage, improve flexibility, and avoid data problems like duplication, insertion, deletion, and update anomalies.

1-161103092724.pptxYashaswiniSrinivasan1

The document defines various forms of database normalization from 1NF to 5NF. It provides examples to illustrate each normalization form and how a database table can be decomposed to satisfy the given normalization form. The goal of normalization is to organize data to eliminate anomalies like data redundancy, insertion anomalies, update anomalies and deletion anomalies. Each successive normalization form builds upon the previous ones and introduces additional constraints to further reduce anomalies and improve data integrity.

Normalization and its various types in DBMSShouvic Banik0139

Databases: NormalisationDamian T. Gordon

Normalisation is a process that structures data in a relational database to minimize duplication and redundancy while preserving information. It aims to ensure data is structured efficiently and consistently through multiple forms. The stages of normalization include first normal form (1NF), second normal form (2NF), third normal form (3NF), Boyce-Codd normal form (BCNF), fourth normal form (4NF) and fifth normal form (5NF). Higher normal forms eliminate more types of dependencies to optimize the database structure.

Bcnfbaabtra.com - No. 1 supplier of quality freshers

This document provides an overview of Boyce-Codd normal form (BCNF) which is a type of database normalization. It explains that BCNF was developed in 1974 and aims to eliminate redundant data and ensure data dependencies make logical sense. The document outlines the five normal forms including 1NF, 2NF, 3NF, BCNF, and 4NF. It provides examples of converting non-BCNF tables into BCNF by identifying and removing overlapping candidate keys and grouping remaining items into separate tables based on functional dependencies.

Database normalizationJignesh Jain

This document discusses database normalization. It begins by defining normalization as the process of removing redundant data from tables to improve storage efficiency, data integrity, and scalability. It then discusses the various normal forms (1NF, 2NF, 3NF, BCNF, etc.) and what conditions a database needs to satisfy to be in each normal form. Examples are provided to demonstrate how to normalize tables that are not in a specific normal form into tables that satisfy that normal form. The document also provides a brief history of normalization and defines some key terms.

Database normalizationVaibhav Kathuria

The document discusses database normalization and its goals of minimizing redundancy and reducing data anomalies. Normalization involves decomposing tables to eliminate non-key attributes that are dependent on only part of a table's candidate key. This involves putting data in first normal form, then second normal form by removing non-key attributes dependent on part of a candidate key, and third normal form by removing transitively dependent non-key attributes. The examples show how data can be normalized from non-normalized tables into tables in 1NF, 2NF and 3NF.

Dependencies in various topics like normalisation and its typesnsrChowdary1

This document discusses database normalization and its goals. It defines various normal forms including 1NF, 2NF, 3NF, BCNF, 4NF and 5NF. The key points are: - Normalization aims to reduce data redundancy, improve consistency, and make a database easier to manage and update. - BCNF requires that every determinant is a candidate key. - Examples of normalization include splitting student enrollment data across multiple tables and moving employee address to a separate table. - Self-assessment questions test the understanding of normalization goals and identifying BCNF.

1-161103092724.pzxsdfdsdrgdrgdfgdfgdfgdfgptxwrushabhsirsat

The document discusses data redundancy and update anomalies in relational databases. It provides examples to show how having redundant data in relations can lead to problems like insertion, deletion, and modification anomalies. Normalization is introduced as a process to organize data in a way that avoids redundancy and anomalies. The document outlines various normal forms including 1NF, 2NF, 3NF, BCNF, 4NF and 5NF and provides examples to illustrate how decomposing relations into these normal forms can eliminate anomalies by removing redundant data.

Assignment#11Sunita Milind Dol

The document discusses database normalization through various normal forms including 1NF, 2NF, 3NF and BCNF. It provides examples of tables that violate different normal forms and how to convert them into the appropriate normal form by removing data redundancies and anomalies through decomposition. The goal of normalization is to organize data to avoid issues with data integrity like insertion, deletion and update anomalies.

1683368767418684.pdfJanoakre

This document discusses database normalization through three forms: first normal form (1NF), second normal form (2NF), and third normal form (3NF). 1NF requires that table rows have unique identifiers and contain atomic values. 2NF builds on 1NF by requiring that rows are only dependent on the full primary key. 3NF builds on 2NF by removing indirect dependencies from tables. The document provides examples of employee and department tables to illustrate how they are normalized through each form.

Advanced NormalizationAbdullah Khosa

Normalization of database tablesDhani Ahmad

This chapter discusses database normalization. It explains the different normal forms (1NF, 2NF, 3NF, BCNF, 4NF) and the normalization process of evaluating and correcting table structures to minimize data redundancies and anomalies. The chapter provides an example of an initial project table that violates normalization and walks through normalizing it to third normal form through identifying dependencies and breaking it into multiple tables. It emphasizes that normalization eliminates issues like partial and transitive dependencies to improve database design.

Normalizationthuvarakan28

Normalization is the process of organizing data in a database to minimize redundancy and dependency. It involves arranging the data into tables and establishing relationships between those tables according to certain forms. The three normal forms - first, second, and third normal form (1NF, 2NF, 3NF) - aim to eliminate different types of structural flaws and anomalies that can occur within the database design. Higher normal forms like BCNF and 4NF further reduce structural problems by removing non-key attributes and multi-valued dependencies.

Normalization ppt for RDBMS PPT FOR BCA and for computer science student..pptxSIR RIP .NET

Normalization is a process for organizing data in a database efficiently by structuring tables according to normal forms to reduce redundancy and dependency. It is aimed at improving data integrity, optimizing performance, and facilitating data retrieval and manipulation. Normalization typically progresses through first, second, third, and higher normal forms, with each form addressing different types of issues like atomicity, partial dependencies, and transitive dependencies. Proper normalization is crucial for building databases that can scale efficiently and are simpler to maintain.

Relational Theory for Budding Einsteins -- LonestarPHP 2016Dave Stokes

This document provides an overview of relational database theory and normalization for developers. It defines key terms like relational databases, logical and physical data models, database schemas, and data normalization. It explains the concepts of first, second, third and Boyce-Codd normal forms and how to normalize data to these forms by removing redundant and unnecessary data through a multi-step process. The goal of normalization is to organize data to minimize duplication and ensure integrity. An example demonstrates normalizing a dog owner database from first to third normal form.

Normalization work as through a series of stages called normal forms .pdfdeepaarora22

Normalization work as through a series of stages called normal forms Normalization is a process that is used for changing attributes to entitles. In order to meet performance requirements you may have to denormalize portions design. Denormalization produces a lower normal form. Normalization is a very important database design ingredient and the highest level is always the desirable. A table is in BCNF if every determinant in the table is a candidate key. A table is in fourth normal form if it is in third normal form and has no independent multivalued dependencies. Repeating groups must be eliminated by making sure that each row defines a single entity. It is possible for a table in 2NF to exhibit transitive dependency, where one or more nonprime attributes functionally determine other nonprime attributes. A determinant is any attribute whose value determines other values within a column. A dependency of one nonprime attribute on another nonprime attribute is a partial dependency. Attributes should clearly define participation, connectivity, and document cardinality. An attribute that is part of a key is known as a(n) attribute. important nonprime prime entity Data redundancy produces. slower lookups robust design efficient storage use data integrity problems Solution 1) Normalization works through a series of stages called normal forms. Answer :- True 2) Normalization is a process that is used for changing attributes to entities. Answer :- False 3) In order to meet performance requirements, you may have to denormalize portions of the database design. Answer :- True 4) Denormalization produces a lower normal form. Answer :- True 5) Normalization is a very important database design ingredient and the highest level is always the most desirable. Answer :- False 6) A table is in BCNF if every determinant in the table is a candidate key. Answer :- True 7) A table is in fourth normal form if it is in third normal form and has no independent multivalued dependencies. Answer :- True 8) Repeating groups must be eliminated by making sure that each row defines a single entity. Answer :- True 9) It is possible for a table in 2NF to exhibit transitive dependency, where the primary key may rely on one or more nonprime attributes to functionally determine other nonprime attributes. Answer :- True 10) A determinant is any attribute whose value determines other values within a column. Answer :- False 11) A dependency of one nonprime attribute on another nonprime attribute is a partial dependency. Answer :- False 12) Attributes should clearly define participation, connectivity, and document cardinality. Answer :- False.

Chuẩn hóa CSDLphananhvu

NormalizationShakila Mahjabin

The document discusses database normalization and different normal forms including 1NF, 2NF, 3NF, and BCNF. The key points are: - Normalization is the process of organizing data to avoid duplication and anomalies when data is inserted, updated, or deleted. - First normal form (1NF) requires that each attribute contains atomic values and each table has a primary key. - Second normal form (2NF) removes subsets of data that apply to multiple rows and places them in separate tables linked through foreign keys. - Third normal form (3NF) requires that all non-key attributes are dependent on the primary key only, not a non-prime attribute. - Boy

Research gadotJotham Gadot

1) Database normalization is the process of organizing data in a database to minimize redundancy and dependency. It involves creating tables and relationships between tables according to specific rules. 2) There are five normal forms - first, second, third, fourth, and fifth normal form - that each aim to eliminate a particular type of undesirable dependency or redundancy. Achieving each subsequent normal form results in a better organized database structure. 3) The goals of normalization include removing duplication, reducing storage needs, simplifying data retrieval and queries, and defining more efficient and flexible data structures. It helps produce a higher quality, better designed database.

normaliztionRamadhani S. Zuberi

This document discusses database normalization. It defines normalization as the process of organizing data in a database to minimize redundancy and dependency. The goals are to eliminate storing the same data in multiple tables and to only store related data together. The document describes the first three normal forms - first normal form eliminates replicated data and creates separate tables, second normal form creates separate tables for values that apply to multiple records, and third normal form eliminates fields that do not depend on the primary key. While third normal form addresses some issues, further normalization is needed to fully remove redundancy from databases.

Normalization in data base management system.pptxanitha803197

Data normailazationLalit Kale

The document summarizes various normal forms for data normalization including: 1) 1NF which eliminates repeating groups by creating separate tables for related data and using primary keys. 2) 2NF which eliminates redundant data by removing attributes that depend on only part of a multi-valued key. 3) 3NF which eliminates columns not dependent on the table's primary key. It also discusses BCNF, 4NF, 5NF, ONF and DKNF which further refine the normalization process. All normal forms make the data model less prone to modification anomalies.

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