AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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Rezumat articol ediţie STUDIA UNIVERSITATIS BABEŞ-BOLYAI În partea de jos este prezentat rezumatul articolului selectat. Pentru revenire la cuprinsul ediţiei din care face parte acest articol, se accesează linkul din titlu. Pentru vizualizarea tuturor articolelor din arhivă la care este autor/coautor unul din autorii de mai jos, se accesează linkul din numele autorului. |
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STUDIA INFORMATICA - Ediţia nr.1 din 2012 | |||||||
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SPECIAL ATTRIBUTES FOR DATABASE NORMAL FORMS DETERMINATION. Autori: . |
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Rezumat: 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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