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    STUDIA INFORMATICA - Issue no. 1 / 2012  
         
  Article:   SPECIAL ATTRIBUTES FOR DATABASE NORMAL FORMS DETERMINATION.

Authors:  .
 
       
         
  Abstract:  

The article deals with the relational schemes defined on the reduced sets of functional dependencies divided into equivalence classes.The concepts of non-essential and recoverable attributes are introduced, and the algorithms for their computing are proposed. Some properties of schemes, based on these attributes, are presented as well.Based on non-essential and recoverable attributes some conditions are introduced to make a relation be in the third or Boyce-Codd normal form.These conditions are just sufficient, because there could be a scheme that is in third or Boyce-Codd normal form but doesn’t satisfy them. In addition, the article suggests a normalization algorithm that takes into account these conditions.

Key words and phrases. Database, Logical design, Non-essential attributes, Recoverableattributes, Third normal form, Boyce-Codd normal form.

 
         
     
         
         
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