[Database class] Part II HW4 details updated

[Paul S. Wang]

Dear DB class,

As you have seen, I have send email to all about some questions
regarding Part II HW4.

Now I have included some of the info in the HW4 statement itself.
Hope it helps.

Paul
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 Paul S. Wang (王士弘)                      Email: pwang at cs.kent.edu            
 Dept. of Computer Science, Kent State U.   Tel: (330) 672-9051
 Kent, Ohio, USA 44242-0001                 http://www.cs.kent.edu/~pwang/ 
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