This video will explain about Composite primary key acts as foreign key...
How to install MySQL, please refer:
https://www.youtube.com/watch?v=M1Mjx9j5wWQ&t=68s
Primary key and foreign key:
https://www.youtube.com/watch?v=asx1UoIWWOM&t=1s
Composite key:
https://www.youtube.com/watch?v=KSoTpEb_5v8&t=85s
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