The FOREIGN KEY constraint is a key used to link two tables together. A FOREIGN KEY is a field (or collection of fields) in one table that refers to the PRIMARY KEY in another table.

Nov 18, 2025 · This article describes how to create foreign key relationships in SQL Server by using SQL Server Management Studio or Transact-SQL. You create a relationship between two tables …

Jul 23, 2025 · In this article, we will explain how to create tables with foreign keys in SQL, with multiple examples and outputs, to help us understand the process. Why Use Foreign Keys in SQL? Foreign …

In SQL, the FOREIGN KEY constraint is used to create a relationship between two tables. In this tutorial, you will learn about the FOREIGN KEY constraint in SQL with the help of examples

Apr 4, 2017 · To create a Foreign Key using the SSMS GUI, using Object Explorer select the referencing table dbo.Product, go to Keys, right click on Keys and select New Foreign Key…: The table designer …

Oct 22, 2024 · We can add a foreign key to any existing SQL table. To do this, we use the ALTER TABLE statement with the ADD CONSTRAINT clause. The general syntax is as follows: ADD …

Here you will learn what is a foreign key and how to established a relationship between two tables using a foreign key in the SQL Server database.

FYI, always best to name your constraints, especially with ORMs in use. And if you just want to create the constraint on its own, you can use ALTER TABLE. add constraint MyTable_MyColumn_FK …

A foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table. The table containing the foreign key is known as the child table, and the table containing the …

Sep 20, 2025 · Write a SQL query to establish a foreign key constraint between the department_id column in the employees table and the id column in the departments table. Write a SQL query to link …