Primary key and foreign key in sql with examples

Applies to: SQL Server 2016 (13.x) and later versions Azure SQL DatabaseAzure SQL Managed InstanceSQL database in Microsoft Fabric

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.

Permissions

Creating a new table with a foreign key requires CREATE TABLE permission in the database, and ALTER SCHEMA permission on the schema in which the table is being created.

Creating a foreign key in an existing table requires ALTER TABLE permission on the table.

Limitations

• A foreign key constraint doesn't have to be linked only to a primary key constraint in another table.

  Foreign key in dbms

• Alter table add foreign key
• Primary key in sql
• Foreign key syntax
• Foreign key example

Foreign keys can also be defined to reference the columns of a constraint in another table.

• When a value other than is entered into the column of a constraint, the value must exist in the referenced column. Otherwise, a foreign key violation error message is returned.

  To make sure that all

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