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3rd Normal Form (3NF)

Third normal form:

In second normal form, all columns in the table rely on the primary key and the table has a singular purpose

There could be relationships between the columns… dependencies could lurk within these columns called transitive dependence.

Transitive dependence means that a value of a column/field within a table relies on a another column in that same table, but this is facilitated through another column between them.

A table is in third normal form when the following conditions are met:

  • It is in second normal form.
  • All nonprimary fields are dependent on the primary key.

Again, transitive dependence means dependence between columns of the same table. Think of ArtistNationality, Artist, and Artwork. The values for ArtistNationality and Artist depend on the Artwork; once you figure out the Artwork, you know the Artist/ArtistNationality. But ArtistNationality depends on the value from Artist: This is a transitive dependence.

In order to get to third normal form, we need to make sure all columns are only dependent upon the primary key. That means we have to get the country code out of the artist table. In the following example, we’ve added country name to the table to further highlight the issue with normalizing

It’s fine that the country code exists in the artist table, but having the country name breaks the 3rd normal form rule, since we can’t get the country name without the code; we can’t get the code without the artist ID. This is by nature the definition of transitive dependence.

Let’s look at some examples that will use the fictional music database as a subject.

we’ll create another table called countries, move the country code and country name to this table. Country code becomes the primary key in the countries table, but is retained in the artist table as a foreign key.

What is Normalization? 

What is Normalization? 

Normalization is a database design technique which organizes tables in a manner that reduces redundancy and dependency of data.

It divides larger tables to smaller tables and link them using relationships.

In this tutorial, you will learn-

The inventor of the relational model Edgar Codd proposed the theory of normalization with the introduction of First Normal Form and he continued to extend theory with Second and Third Normal Form. Later he joined with Raymond F. Boyce  to develop the theory of Boyce-Codd Normal Form.

Theory of Data Normalization in Sql is still being developed further. For example there are discussions even on 6th Normal Form. But in most practical applications normalization achieves its best in 3rd Normal Form. The evolution of Normalization theories is illustrated below

1st Normal Form >> 2nd Normal Form >> 3rd Normal Form >>4th Normal Form >>  5th Normal Form >>6th Normal Form

Database Normalization Examples –

Assume a video library maintains a database of movies rented out. Without any normalization all information is stored in one table as shown below.

Further We shall discuss on different normal forms in detailed:

 

 

 

 

 

 

SQL Server next version CTP 1.4

Microsoft is excited to announce a new preview for the next version of SQL Server (SQL Server v.Next). Community Technology Preview (CTP) 1.4 is available on both Windows and Linux. In this preview, they added the ability to schedule jobs using SQL Server Agent on Linux. We can try the preview in your choice of development and test environments now: www.sqlserveronlinux.com.

Key CTP 1.4 enhancements
The primary enhancement to SQL Server v.Next on Linux in this release is the ability to schedule jobs using SQL Server Agent. This functionality helps administrators automate maintenance jobs and other tasks, or run them in response to an event. Some SQL Server Agent functionality is not yet enabled for SQL Server on Linux. To learn more and see sample SQL Server Agent jobs, you can read detailed blog titled “SQL Server on Linux: Running scheduled jobs with SQL Server Agent” or attend an Engineering Town Hall about “SQL Server Agent and Full Text Search in SQL Server on Linux.”

The mssql-server-linux container image on Docker Hub now includes the sqlcmd and bcp command line utilities to make it easier to create and attach databases and automate other actions when working with containers. For additional detail on CTP 1.4, please visit What’s New in SQL Server v.Next, Release Notes and Linux
documentation.

In addition, SQL Server Analysis Services and SQL Server Reporting Services developer tools now support Visual Studio 2017. They are available for installation from the Visual Studio Marketplace providing the option for automatic updates going forward.

 

Get SQL Server v.Next CTP 1.4 today!
Try the preview of the next release of SQL Server today! Get started with the preview of SQL Server with our developer tutorials that show you how to install and use SQL Server v.Next on macOS, Docker, Windows, and Linux and quickly build an app in a programming language of your choice.

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SQL School: Best Trainers for Microsoft SQL Server Technologies

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About SQL School Training Institute

SQL School (Regd: SequelGate Innovative Technologies Pvt. Ltd.) is strongly committed to provide complete real-time and practical training exclusively on Microsoft SQL Server and Datawarehousing technologies. SQL School Training Institute established in February, 2008 is now one of the best training institute offering SQL Server and T-SQL (SQL Server) Training, SQL Database Administration (SQL DBA) Training and Business Intelligence (MSBI / SQL BI) Training.

 

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Mail: contact@sqlschool.com
Skype: SQL School
Address/Map
USA: +1 (510) 400 – 4845
India: +91 (040) 64577244 / 66343536 (Off)
India: +91 09666440801 (Mob)