Database Quiz

I sat for this database quiz recently. And unfortunately i flunk it. 19/50 just because of conceptual error. Superkey is not a key and I lost 25 marks. WTF. Seriously. Only in NTU then it is not a key. Such a question can be so deadly. And not even one or two marks is awarded to me. Damm.... my life. A DBA aspired how can score that badly. Guess I have to work extremely hard now. But I realise one thing, I have learn how to cope with failures and move on. Something which I say I can't in the past. Will post all the lab answer and quiz after the semester to share with all other ppl. My aim this semester to break into second lower honour. Hopefully.