Professor,

In your PPT slides, you said that a super key is a "superset of a key". Since you did not say "proper superset of a key", is it true that every key is also a super key?

For example, we said in class that {id, assignment} is the key of the class_records table. Does this mean that {id, assignment} is also a super key of that table?

Thank you.

- Peter Tran

Wow, that was quick. Thank you again.