FOREIGN KEY. 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.

Feb 4, 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 when you want to associate rows of one table with rows of another.

Just a quick fix: the correct way to reference is: REFERENCES MyOtherTable (MyOtherIDColumn) MyTable_MyColumn_FK is the best naming practice. question_id uniqueidentifier primary key, question_exam_id uniqueidentifier not null, question_text varchar(1024) not null, question_point_value decimal,

Jan 15, 2025 · The syntax to create a foreign key in CREATE TABLE statement is: CONSTRAINT fk_constraint_name FOREIGN KEY (column1, column2, …) REFERENCES parent_table (column1, column2, …) ); The syntax to add a foreign key with ALTER TABLE statement is: ADD CONSTRAINT fk_constraint_name FOREIGN KEY (column1, column2, …)

Apr 4, 2017 · I need to create a Foreign Key relationship between two SQL Server tables and I would like to know how this is done using the SQL Server Management Studio (SSMS) GUI as well as using T-SQL scripts. I already have the tables created, but how do I create the Foreign Key relationship.

This tutorial helps you understand SQL foreign key and show you how to define a foreign key using the FOREIGN KEY constraints.

To create a foreign key, you use the FOREIGN KEY constraint. The following statements drop the vendors table and recreate it with a FOREIGN KEY constraint: CREATE TABLE procurement.vendors ( vendor_id INT IDENTITY PRIMARY KEY, vendor_name VARCHAR (100) NOT NULL, group_id INT NOT NULL, CONSTRAINT fk_group FOREIGN KEY (group_id) .

Apr 5, 2019 · In this article let us review different ways to create a SQL foreign key, rules on updates and deletes, enabling foreign key constraints, disabling foreign key constraints and not for replication in foreign keys.

Foreign key constraints can be created in two ways in SQL Server: A foreign key can be configured in the create table T-SQL script. Append CONSTRAINT REFERENCES statement at the end of all column declaration.

Mar 13, 2025 · 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 CONSTRAINT foreignKeyName. FOREIGN KEY (columnName) REFERENCES referencedTable (referencedColumn) ON DELETE action. ON UPDATE action;