By Marshall C. Yovits
This quantity in a chain detailing ideas in all points of desktop technology, is anxious with relational databases, tactile details processing and research, object-oriented procedure improvement equipment; opposite engineering, multiprocessing, overseas computing, and others.
Read Online or Download Advances in Computers, Vol. 35 PDF
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Extra resources for Advances in Computers, Vol. 35
6. In this simple representation there is only a single process, called “Registration,” and the sources Student and Course connected to the process by means of data flows. Taking into account the F-schema we derive a very DESIGN OF RELATIONAL DATABASES 37 simple D-schema consisting of the entity types Student and Course and connected by the relationship type requesrs. Now we consider the F-schema again. ” This shows, that in the D-schema some additional concept needs to be repreqented. In particular, this is an entity type Course Requirements containing the information about courses that have to be taken in advance in order to be able to register for a particular course and a Request Log where each request is stored.
Parametric text is text in natural language with some empty fields that should be filled in. The text along with additional indications forms the intensional part of the form. An example of parametric text is We certify that ........................ (First Name) in ..................... , and enrolled in the (city, Town) course ................. (Course Number) on . /. /19. . has passed it with ............... (Letter Grade) DESIGN OF RELATIONAL DATABASES 21 Parametric text may indicate the existence of certain attributes and their domains.
Entity type integration. 44 S. B. NAVATHE AND G. PERNUL by the attributes that are in the integrated schema in ATTR(E) while ATTR(E2) is also in the integrated schema reduced by ATTR(E). To illustrate, consider the example where the two entity types under consideration are El : Graduate Student (Department, Name, Birthpate, Name, Birthpate, SalDegree), and E2 : Instructor (Department, SSJ, ary, Experience). Assume, that some graduate students may be instructors but not all of them and that not all instructors are graduate students.