By Marshall C. Yovits
This quantity in a chain detailing thoughts in all features of desktop technological know-how, is worried with relational databases, tactile details processing and research, object-oriented procedure improvement equipment; opposite engineering, multiprocessing, overseas computing, and others.
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Extra info for Advances in Computers, Vol. 35
If RWS(EI) c RWS(E2), real-world objects represented by El are included in E2 at any time. In this case, the integrated schema will have the two entity types El and E2, where El is a subclass of E2. Consider the example where the two entity types under consideration are El : Graduate-Student (Department, SName, Degree, Support) and E2 : Student (SNo, - GPA). In this example, the attributes of each class are shown in parentheses and key attributes are underlined. Obviously, RWS(Graduate-Student) t RWS(Student) holds because at all times, the set of graduate students is a subset of the set of students.
Faculty :Department, (1 : 1). Faculty member may chair a department. Student :Course, (N:M ) . Students enroll in courses and will get a letter grade at a certain date for each enrolled course. Department :Course, (1 :N ) . Departments offer courses. 16 S. 1. B. NAVATHE AND G. PERNUL Entity Description Name: Estimated Cardinality: Integrity Constraints: Description: Attribute Description Attribute Name: Description: Domain: Restrictions on the Do& 0 Valueset: Predicate: Existence Dependency: Null value allowed: Repetition factor of the value within entity typC: Number of unique values within entity type: Unique Identifier (Yes/No): Interdependencywith foUowing other attributes: Relationship description Relationship Name: Description of Relationship Participating Entity Types: Degree of the Relationship: Connectivity (with all participating Entity Types): Mandatory / Optional: Attributes of the relationship type Attribute Name: Description: Domain: Restrictions on the Domain 0 Valueset: Predicate: Existence Dependency: Null value allowed: Repetition factor of the value within relationship type: Number of unique values within relationship typc: .
The only difference is that EI and E2 in the integrated schema will be disjoint in this case. w, a, The integration rules for integrating entity types represented in different views just described can also be generalized for the integration of n entity types at a time. A detailed discussion of all four cases for strategies for nary integration can be found in Elmasri and Navathe (1984). 3 Integration of Relationship Types The integration of relationship types depends on the semantics they represent.
Advances in Computers, Vol. 35 by Marshall C. Yovits