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We will explain here an example database application having COLLEGE database and use it in showing several E-R modelling concepts.
College database remains track of faculty, Students, Departments and Courses organised by several departments. Following is the explanation of COLLEGE database:
College have several departments like Department of Hindi, Department of English, and Department of Computer Science etc. Every department is assigned a unique id and name. Some faculty members are also appointed to each department and one of them works as head of the department (HOD).
There are several courses conducted by every department. Each course is assigned a unique id, name and duration.
A video rental company has several branches. The data held on each branch is the branch address made up of street, city, state, and zip code, and the telephone number. Ea
random file sharing
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Describe the candidate key functions ? Candidate Key and Alternate Key: In some instances, an entity will have more than one attribute which can serve as a primary key. Any key
Draw an entity relationship diagram (ERD) for the following situation: A company has a number of employees. Each employee is identified by an Employee_Id. The company wants to st
A Functional dependency is described by X Y between two groups of attributes Y and X that are subsets of R specifies a constraint on the possible tuple that can make a relation
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