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Differentiate OO development from structured development.
Structured approach of problem solving is based upon the idea of decomposition of system into subsystem. In this approach of system development, readjustment of some new changes in system is very hard. While as in object oriented approach holistic view of application domain is considered and the related objects are identified. Further categorization of objects is done. Object oriented approach provide space for further enhancement of system without too much increase in the systems complexity.
During the deletion of a tuple two cases can happen: Deletion of tuple in relation having the foreign key: In this type of case simply delete the desired tuple. For example, in
The need for three level architecture The aim of the three level architecture is to divide each user's view of the database from the way the database is physically shown.
Explain What is Relation? A database relation is a predefined row or column format for storing information in a relational database. Relations are equal to tables.
What is called an evaluation primitive? A relational algebra operation annotated with instructions on how to evaluate is known as an evaluation primitive.
Self-Join: In a self join a table is joined with itself. Let consider the following sample partial data of EMP table EMPNO ENAME MGRID
Part: Recommended (Non-query) Optimisations This section entitled "Recommended (non-query) optimisations" should be a brief report containing recommended optimisations you would
Explain several types of constraints that can be specified using CREATE TABLE command. Explain CASCADE and RESTRICT clauses of DROP SCHEMA command? Constraint Description PRIM
What is known as sequential file organization? In the sequential file organization, the records are kept in sequential order, according to the value of a "search key" of every
What is the main advantage of the object model? What are its different components? The object model focuses on the logical data structures. Each object model comprises of many
The physical location of a record is determined by which mathematical formula that transforms a file key into a record location? The physical location of a record is determined
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