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Determine the OBJECTIVES of object design
After passing through this unit, you should be able to:
Let consider the given partial relation EMP. Let us make some sub-queries for them EMPNO ENAME JOB SAL DEPTNO 7566
Consider the relation schemas as follows. works (person name, company name, salary); lives (person name, street, city); located in(company name, city); managers (person name
what is bogus empowerment. And what is genuine empowerment
Write short notes on extension and intension? In any data model, it is significant to distinguish among the description of the database and the database itself the description
Implementation of association as an object Implement as a separate association object, independent of either class, as in Figure. An association object is a group of pairs
Which is another name for weak entity? Child is another name of weak entity.
what is union compatable?
Explain what is Aggregation ? Aggregation: This is used whenever we intend to show a relationship between an entity and the relationship. There is no provision for this in th
Explain the Cartesian product: The Cartesian product operation does not need relations to union-compatible. The meaning of this is that the involved relations may have dissim
what are the main characteristics of database
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