In SQL, you create a relationship by creating a foreign key constraint.
More specifically, you have a parent table and a child table. The parent contains the primary key, and the child table contains a foreign key that references the primary key of the parent table.
When you use SQL to create a relationship, you can create the relationship at the time you create the table, or you can create it later (by altering the table). This article covers both scenarios.
Continue readingWhen you create a table in SQLite, you can also create a foreign key in order to establish a relationship with another table.
This article provides an example of creating a foreign key when creating a table in SQLite.
Continue readingIn SQLite, foreign key constraints are not enforced unless foreign key support has been enabled.
Enabling foreign keys involves the following:
In database terms, a foreign key is a column that is linked to another table‘s primary key field in a relationship between two tables.
A foreign key is a type of constraint, and so if you want to create a foreign key in SQL Server, you’ll need to create a foreign key constraint.
This article demonstrates how to create a foreign key constraint in SQL Server, using Transact-SQL.
This article is Part 2 of the Microsoft Access tutorial.
Here’s what’s included in this article:
To create a relationship in MySQL Workbench:
The relationship is now established. Repeat steps 4 to 6 for any other foreign key columns in that table.
To create a relationship in Access 2013 or 2016:
This will create the relationship. You will see the tables in the Relationship tab with lines depicting the relationship between the tables.