Entities and Relationships are expressed in E-R diagrams [ L3 , L11 , L15 ] . Entity types are represented by rectangular-shaped boxes; and relationship types are represented by diamond- shaped boxes. Figure Lb illustrates the entity typesanbsp;...
|Title||:||Tutorial, centralized and distributed data base systems|
|Author||:||Wesley W. Chu, Peter P. S. Chen, IEEE Computer Society|