What are the differences between primary keys and foreign keys in SQL?
An example of an AI chatbot conversation about SQL keys and their differences.
What are the differences between primary keys and foreign keys in SQL?
Primary keys uniquely identify a record in a table, while foreign keys link records between tables.
Can a table have multiple primary keys?
No, a table can only have one primary key, but it can consist of multiple columns (composite key).
What happens if a foreign key doesn't match any primary key?
If a foreign key doesn't match any primary key, it results in a constraint violation, preventing the record from being added.
Are primary keys always indexed?
Yes, primary keys are automatically indexed to ensure fast retrieval of records.
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