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Type of views:
Simple views and Difficult Views
Feature
Simple Views
Complex Views
Number of tables
One
One or more
Contain Functions
No
Yes
Contain groups of data
Data Manipulation
IS allowed
Not always
Let us look into some of the examples. To see all the details about existing views in
Oracle:
SELECT* FROM USER_VIEWS;
How many types of Views are there? There are Four types of views:- Database View Help View Projection View Maintenance View
What are the technique to define a schema completely ? A schema is completely define by DDL and DML query language.
How does Tuple-oriented relational calculus vary from domain-oriented relational calculus? The tuple-oriented calculus uses a tuple variables i.e., variable whose only allowed
In an E-R diagram an entity set is represent by? In an E-R digram entity set is represted by rectangle.
What is an ER diagram? Why is it used in Database management system (DBMS)?
E-R model uses this symbol to represent weak entity set ? A Doubly outlined rectangle symbol is used to represent weak entity set.
define anomalies and different types of anomalies with example
Write short notes on domain relational calculus The domain relational calculus uses domain variables that take on values from an attribute domain rather than values for whole
Describe Parameteric end users? Parametric end users might be given update access, but are commonly not permitted to change the structure of data.
Describe different steps of the object-oriented design process. The broad steps of the object-oriented design process are: a. Define context and modes of use of the system
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