What is the difference between primary keys and foreign keys in databases?
An example of an AI chatbot conversation about primary and foreign keys in databases.
What is the difference between primary keys and foreign keys in databases?
A primary key uniquely identifies each record in a table, while a foreign key links to a primary key in another table.
Can you give me an example of each?
Sure! In a 'Users' table, 'UserID' can be a primary key. In an 'Orders' table, 'UserID' can be a foreign key linking back to 'Users'.
Why are foreign keys important?
Foreign keys maintain referential integrity between tables, ensuring that relationships between data are consistent.
What happens if a foreign key doesn't match a primary key?
If a foreign key doesn't match a primary key, it can lead to data integrity issues, and the database may reject the entry.
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