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Illustration of implementation of inheritance
Let us take the illustration of implementation of inheritance. Suppose that we are about to implement the Stack class and by now we have a List class available. You can be tempted to create Stack inherit from List. Pushing an element onto stack can be achieved by adding an element to end of list and popping an element from a stack corresponds to removing an element from end of the list. But, you are also inheriting unwanted list operations which add or remove elements from arbitrary positions in list.
In Database software have only pure security or some dis secured by administrator?
Views A view is like a window by which data from tables can be changed or viewed. The table on which a view is based is known as Base table. The view is stored as a SELECT stat
About Attribute inheritance
A student entity type has the following attributes,name..
Define the step - Rearranging the Execution Order for Efficiency As we know that algorithm and data structure are closely related to one another, but data structure is conside
Which operations need the participating relations to be union compatible? A UNION, INTERSECTION and DIFFERENCE operations need the participating relations to be union compatibl
What type of view of total database content? Data base content Conceptual view of total database contain.
What is use of generating such tables? How can you create temporary tables? When you require a table only for a short time after that you want it to disappear automatically you
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
Define Signal. It allows methods to respond to events triggered by themselves or by other processes. Each signal corresponds to an exacting event. A signal is represented in Sy
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