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There is a clarification of the lecture slide.
Definition (Second Normal Form): A relation scheme is in second normal form (2NF) if all non-prime attributes are fully functionally dependent on the candidate keys.
The relation keys here mean candidate keys, and we update the slides to make it clear
The affected slides have been updated.
There is a mistake in the provided assignment 1 sample solution. The derived attributed 'Number of Artists' should be an attribute of the entity 'company'.
During the marking, we have recognised this and mark it right. We have updated the sample solution.
In the exam, please follow this rule if facing similar situations.