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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.
Draw an ER diagram that shows the organization of a simple student database. The database captures the information about letter grades obtained by university students who enrolled
What is the use of group by clause? Group by clause is used to be relevant aggregate functions to a set of tuples. The attributes given in the group by clause are used to shape
how to design tables
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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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An employee record has the following structure struct employee { int eno; char name[22]; float salary; char dept[10];}; (i) Calculate the record size R in bytes.
Explain Candidate key? Candidate Key - A candidate key is a minimal superkey, that can be used to uniquely identify a tuple in the relation.
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Using SQL create a view RS for the relations R and S. The view consists of the columns A and D renamed as X and Y in that order. Insert a tuple into it. Show the contents of t
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