What is the difference between composite keys and primary keys in databases?
An example of an AI chatbot conversation about composite keys and primary keys in databases.
What is the difference between composite keys and primary keys in databases?
A primary key is a unique identifier for a record in a table, while a composite key is made up of two or more columns to 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.
Are there any advantages to using composite keys?
Yes, composite keys can enforce uniqueness across multiple columns, which is useful in many-to-many relationships.
When should I use a composite key instead of a primary key?
Use a composite key when a single column cannot uniquely identify a record, especially in relational databases with complex relationships.
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