What is a foreign key in SQL?
An example of an AI chatbot conversation about SQL foreign keys and their usage.
What is a foreign key in SQL?
A foreign key is a field in one table that uniquely identifies a row of another table. It establishes a relationship between the two tables.
Can you give me an example of how to use a foreign key?
Sure! If you have a 'Customers' table and an 'Orders' table, the 'Orders' table can have a foreign key that references the 'CustomerID' in the 'Customers' table.
What happens if I try to delete a record that has a foreign key?
If you try to delete a record that is referenced by a foreign key in another table, you will get an error unless you have set up cascading deletes.
How do I set up a foreign key constraint in SQL?
You can set up a foreign key constraint using the FOREIGN KEY keyword in your CREATE TABLE statement or by altering an existing table.
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