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2 - A canidate key is a subset of a superkey (hence, why it is also called a "minimal superkey"). A superkey is capable of uniquely identifying all rows. #2 is the only one that doesn't list all of the attributes. Hence, it can't be a superkey .
I implement this on my website
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Database Normalization #9
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2 - A canidate key is a subset of a superkey (hence, why it is also called a "minimal superkey"). A superkey is capable of uniquely identifying all rows. #2 is the only one that doesn't list all of the attributes. Hence, it can't be a superkey . I implement this on my website