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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;
Draw an Entity-Relationship model for the relational schema given in the Appendix. Show all the entities, relationships, relationship names, and attributes and also underline the
Write short notes on extension and intension? In any data model, it is significant to distinguish among the description of the database and the database itself the description
Consider a typical sales invoice that would include the following information. Design a single table to hold all of the information required to store an invoice including this info
Do you have experts of the dbms
What is trigger Triggers are statements that are implemented automatically by the system as the side effect of a change to the database.
what is Lossless-join decomposition
Convert the following ER - diagram (Entity Relationship Diagram) into a relational database (the primary keys are underlined): Ans: The relational database schema f
First Normal Form and second normal form First Normal Form (1NF) A relation is said to be in 1NF if it having no non-atomic values and each row can give a unique combinat
Define what Immediate database modification technique uses? Ans: Both undo and redo.
What are object interaction diagrams? Object interaction diagrams are the diagrams that used to describe order in which messages are communicated in execution of an operation,
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