SQL tutorials 18: SQL Foreign Key Constraint By Manish Sharma
SQL tutorials 18: SQL Foreign Key Constraint By Manish Sharma. SQL Tutorial 18: SQL foreign key constraint.
Topic covered in this tutorial
1. Defining SQL foreign key using create table at column level
2. Defining SQL foreign key using create table at table level
1. Defining SQL foreign key using Alter Table statement
Website article: http://www.rebellionrider.com/sql-foreign-key.htm
Primary key tutorial: http://www.rebellionrider.com/sql-foreign-key.htm
Create Table Tutorial: http://www.rebellionrider.com/sql-create-table.html
Tool used in this tutorial is SQL Developer.
This tutorial series is part of SQL expert exam certification training. if you are preparing for SQL certification you can use my tutorials. This SQL Tutorial is a part of free training.
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This is Manish from RebellionRider.com
Foreign key is an Input/output data constraint which is also known as referential integrity constraint.
Foreign key represent a link or say a relationship between columns of tables.
Similar to primary key constraint Foreign Key constraint is also of two types.
Simple Foreign key constraint and
Composite Foreign key constraint.
Constraint which involves only one column in foreign key in child table and one column in reference key in parent table is called Simple Foreign Key. While the constraint which involves more than one column in foreign key in child table and more than one column in reference key in the parent table is called Composite Foreign Key.
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SQL Tutorial 19 : ON DELETE SET NULL foreign key Clause.
Links used in the tutorial
On delete set null website article [ download SQL script from same link] :
Foreign Key Tutorial Video : http://y...
Donate!: http://bit.ly/DonateCTVM2. Child tables reference a primary key using a foreign key. This helps us design our relationships properly. Later in this series we will learn how the child table inherits values from the parent table and (in some ins...
Blog link: http://www.rebellionrider.com/sql-primary-key.htm
SQL tutorial on Primary key / SQL Primary key,
In this tutorial you will learn about
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