How to add foreign key in sql | Basic Concept of Foreign key Constraint | Sql table foreign key

Опубликовано: 16 Октябрь 2024
на канале: rejawebs

Hello all of you
Welcome to tutorial on FOREIGN key Constraints in SQL
In this tutorial we will try to know the basic concept of foreign key Constraint in sql.

FOREIGN KEY Constraint
A FOREIGN KEY 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.

SQL Syntax:
Table_Column_Name DataType FOREIGN KEY REFERENCES Table_Name(Foreign_Table_Column_Name)

So, let's go to the query window to see how to use foreign key constraint..
CREATE TABLE CustomerOrder (
CustomerOrderId int NOT NULL PRIMARY KEY IDENTITY(1,1),
OrderNumber int NOT NULL,
CustomerId INT FOREIGN KEY REFERENCES [dbo].[CustomerInfo](CustomerId)
);

ALTER TABLE CustomerOrder
ADD FOREIGN KEY (CustomerId) REFERENCES [dbo].[CustomerInfo](CustomerId);
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