What are the different types of keys in SQL and how do they ensure data integrity?
An example of an AI chatbot conversation about SQL keys and their role in data integrity.
What are the different types of keys in SQL?
In SQL, the main types of keys are Primary Key, Foreign Key, Unique Key, and Composite Key. Each serves a unique purpose.
How does a Primary Key ensure data integrity?
A Primary Key uniquely identifies each record in a table, preventing duplicate entries and ensuring data accuracy.
What is the role of Foreign Keys?
Foreign Keys create a link between two tables, enforcing referential integrity by ensuring that a value in one table corresponds to a valid entry in another.
Can you explain what a Unique Key is?
A Unique Key ensures that all values in a column are different, allowing for one null value, which helps maintain data integrity.
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