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What are advantages of object models?
Object models are efficient for communicating with the application experts and reaching a consensus about the significant aspects of the problem. Object models help developers to achieve a consistent, efficient, understandable and correct database design.
Explain ER Relationship model? An entity-relationship model (ERM): An entity-relationship model (ERM) is an abstract theoretical illustration of structured data. Entity-relatio
The Conceptual Level or Global level The conceptual level presents a logical view of the complete database as a unified whole. It permits the user to bring all the data in th
entity relationship diagram for online examination system
Database design Database tables will be created for you on the Technology web server. The schema will be as follows. Please note that this is a simplified database structure, d
Whst is logical schema ? Logical schema is the entire database.
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
What is storage manager? A storage manager is a program module that gives the interface between the Low level data kept in a database and the application programs
Explain retrieval in QBE? Retrieval in QBE : A "GUI" for expressing queries. Based on the Domain Relational Calculus (DRC) Actually invented before GUIs. Very co
What is DML Query Langauge? Data Manipulation Language (DML) - A data manipulation language is a language in which enables users to access or manipulate data as organized throu
Creation of Indexes Automatically: When a primary key or Unique constraint is show in a table definition then a unique index is formed automatically. Manually: User can
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