… databases and relational databases which use abstracted characteristics. Fig.l(a) … a
simplified diagram of the usage of constraints in conventional relational databases. In the …

… , providing a mathematical abstraction for the construction of applications in terms of the …
a relation ABSTRACT with all the attributes capturing recurring information and a relation …

… for the organization of relational databases. In particular this … We wilt use the term “generalization”
in the folIowing way: A … a Codd relation, we must select a set of attributes which are …

… In short, the book is meant to retain those features that made the … data structures (at the
slightly higher level of abstraction than procedural languages used at that time), much of the data …

… This section regards the relational database in the way it has … To state the obvious: A
database is always an abstracted … that is one of the databaseʼ properties as shown in the …

… of the relational databases and … ABSTRACTION relation provides abstract values for
individual specialized values, it can be used as an intermediary between the two joined attributes …

… data models such as the entity-relation diagrams, abstract from … with attributes and relational
links, called relational concept … -oriented or object-relational databases, the individuals to be …

… We use the term “model” to mean an abstract representation of some real-world problem…
“data” and “models” use a different representation technique. This section examines the features …

… , the relationship named employees in the department di uses … to relational databases, which
use the value of attributes to link … Some systems have abstracted this to frameworks that use …

… In the database field, the requirement of high level facilities for retrieval/… relational database
point of view for contribution to this problem is to provide 1) efficient processing of relational …