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In the first unit of this block, you have been given with the details of the Database Management System, its structure, advantages etc. This unit is an attempt to give you information about E-R models and relational. The relational model is a widely used model for DBMS execution. Most of the commercial DBMS products available in the industry are relational at core. In this part we will talk about the operators, terminology and operations used in relational model.
The second model discussed in this section is the E-R model, which mostly is a semantic model and is very essential in creating raw database design that can be further normalised. We talk about DBMS E-R diagrams, and their conversion to tables in this part.
After Reading this unit, you should be able to:
• Explain relational model and its advantages;
• Execute basic operations using relational algebra;
• Illustrate an E-R diagram for a given problem;
• Change an E-R diagram to a relational database and vice versa.
What is called query processing? Query processing refers to the range of activities included in extracting data from a database.
what is multivalued dependency
Problem : AirwaysCentre, an international airline booking company currently uses a relational database system for their operations, which includes the following relations: P
Creating views with Read only option : In the view definition this option is used to make sure that no DML operations can be done on the view.
Give two profit of Reuse of Code. Reusing the implementation . Place existing class directly inside a new class. The new class can be made up of any number and type of the oth
While sorting field groups we cannot use more than one key field False.
Different stages of DDLC ?
Explain what is DDL? DDL - Data Definition Language: statements used to define the database structure or schema. Some examples: CREATE - to create objects in the database ALT
Normalize the following tables upto and including the 3NF. Submit a 1 page printout of only the final set of normalized tables in Data Architect. Just use Data Architect to do the
What is trigger Triggers are statements that are implemented automatically by the system as the side effect of a change to the database.
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