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Explain the concept of Modeling With Objects
A model is a conceptual representation of a specification, design or system from a particular point of view. A modelling language is a way of expressing different models produces during development process. It is a collection of model elements. It is usually diagrammatic. It has
syntax - the rules that finds which diagrams are legal
semantics - the rules which determine what a legal diagram means.
In Database software have only pure security or some dis secured by administrator?
What is horizontal fragmentation? Horizontal fragmentation divides the relation by assuming every tuple of r to one or more fragments
Load sample data into the database tables design and test queries to return the following information • All rows and columns for employees • All rows and columns for customers •
Define Partial Key and Primary Key A partial key, also known as discriminator, is the set of attributes which can uniquely identify weak entities that are related to similar o
Explain DML with some examples? DML - Data Manipulation Language: statements used for managing data within schema objects. Some examples: • SELECT - retrieve data from the a da
Explain five duties of Database Administrator? 1. DBA administers the three stages of the database and, in consultation along with the whole user community, sets up an defin
differences between a classified catalog and a dictionary catalog
Write a program within embedded SQL to associative the total trip expenses of the salesman named ‘John' for the relations. EXEC SQL BEGIN DECLARE SECTION; long total_expenses;
what do you understand by enhanced entity-relationship
(a) Explain briefly the three parts of a relational Model. (b) Contrast the following terms with an appropriate example: (i) stored attribute v/s derived attribute (ii) en
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