EIgushev

The authors consider principles of creating database constructors which have a convenient graphical user interface and a universal normalization tool. The constructor allows operating not only with attributes and functional dependences, but also with entities which unite attributes. The database structure normalization algorithm is based on Ullman algorithm which additionally carries out analysis of keys entry into determinants and dependant parts of functional dependences, and which also reveals entities unambiguously determining one another. The algorithm is adapted to the presence - in the structure - of not only attributes but also entities that unite attributes.