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Attributes that are directly kept in the data base. For example, 'Birth date' attribute of a person. Derived Attributes that are not stored directly but can be derived
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
I need help with some assignments
What is a disjoint less constraint? Ans: It needs that an entity belongs to no much more than one level entity set. Disjoint less constraint needs that an entity belongs to
need to get answer for questions 3&4 on this page in part 1
Describe Parameteric end users? Parametric end users might be given update access, but are commonly not permitted to change the structure of data.
What is the way a particular application views the data from the database that the application uses? Sub schema is the way a particular application views the data from the data
What is a guard condition? Explain it with a suitable example. The guard-condition is a Boolean expression written with respect to parameters of triggering event and attributes
Consider the 1ollowin8 relation: CAR SALE (Car_id, Option_type, Option_listprice, Sale_date, Option_discountedprice) This relation refers to options installed in cars (e.g., crui
Discuss the term- Design Optimization We have seen various ways of representing the objects.The fundamental design model uses analysis model as the framework for implementati
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