Semantically Unconnected Relational Schemes (CROSBI ID 36816)
Prilog u knjizi | izvorni znanstveni rad
Podaci o odgovornosti
Mateljan, Vladimir ; Tkalac, Slavk ; Čubrilo, Mirko
engleski
Semantically Unconnected Relational Schemes
By means of normalizing data the relational scheme is decomposed into several smaller and more regular sub-schemes. During the decomposition there should be no loss of information. Using the Aho, Beri and Ullman algorithm it is possible to prove that the initial set of information has been kept. Using Rissanen criterion of component independence, it is possible to prove the same thing in a far simpler and faster way. Therefore, Rissanen test is of extreme importance in the process of designing a database. We will show in the work that Rissanen test is sufficient but not a necessary condition in proving the reversibility of the decomposition of the relational scheme, i.e. we will show that the decomposition of the relational scheme can be reversible even if the Rissanen test is not met.
funkcijska zavisnost, relacijska shema, gubitak zavisnosti
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o prilogu
21-28.
objavljeno
Podaci o knjizi
Zbornik radova "Težakovi dani"
Tkalac, Slavko ; Lasić-Lazić, Jadranka
Zagreb: Zavod za informacijske studije Odsjeka za informacijske i komunikacijske znanosti Filozofskog fakulteta Sveučilišta u Zagrebu
2002.
953-175-182-X