[Database class] procedure problem and fix

[Paul S. Wang]

Dear DB class,

I have fixed the example and you can go back and give it a try
again.

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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