foreign key

How Are Foreign Keys Implemented?

Foreign keys are typically implemented through SQL (Structured Query Language) in relational databases. You can define a foreign key constraint when creating or altering a table. For example, in SQL, you might use the following syntax to create a foreign key:

sql
ALTER TABLE Orders
ADD CONSTRAINT fk_customer
FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID);

Frequently asked queries:

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