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What is object identity?
An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
Type of database technology
One-way Associations When an association is traversed only in the one direction, then it is implemented as a pointer i.e.an attribute which contains an object reference. If mu
What does Aggregation mean?
Assume that you are responsible for selecting a new DBMS product for Sohar Hospital
examples of fields in a database
Chapter 1 - Profile for the Organization You have to select an organization of your choice and assume that you work for that organization. Now you must prepare a brief profile of t
What is conceptual model ? A conceptual model is a independent of both hardware and software.
Backward Recovery (UNDO): In this system the uncommitted changes made by a transaction to a database are undone. Instead the system is reset to the last consistent state of databa
Relational Algebra is a set of basic operations used to influence the data in relational model. These operations allow the user to specify basic retrieval request. The result of re
A full discription of the new, a discription of its components, and the bebefit it will provide a company. A disscussion of the information usedin the system. A disscussion of any
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