How do I create a foreign key in SQL?
An example of an AI chatbot conversation about creating foreign keys in SQL.
How do I create a foreign key in SQL?
To create a foreign key in SQL, you can use the FOREIGN KEY constraint in your table definition.
Can you show me an example of how to do that?
Sure! Here's an example:
CREATE TABLE Orders (
OrderID int,
CustomerID int,
FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID)
);
What if I want to add a foreign key to an existing table?
You can use the ALTER TABLE statement. For example:
ALTER TABLE Orders
ADD CONSTRAINT fk_customer
FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID);
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