What is the difference between primary and composite keys in databases?
An example of an AI chatbot conversation about primary and composite keys in databases.
What is the difference between primary and composite keys in databases?
A primary key is a unique identifier for a record in a database table, while a composite key is made up of two or more columns that together uniquely identify a record.
Can you give me an example of a composite key?
Sure! In a table for student enrollments, a composite key could be made up of 'student_id' and 'course_id' to uniquely identify each enrollment.
Why would I use a composite key instead of just a primary key?
You would use a composite key when a single column is not sufficient to uniquely identify a record, especially in many-to-many relationships.
Are there any drawbacks to using composite keys?
Yes, composite keys can complicate queries and indexing, and they may require more storage space compared to a single primary key.
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