Discuss along with examples about several types of er model, Database Management System

Assignment Help:

Discuss along with examples about several types of attributes present in the ER model?

Types of Attributes are:
• SIMPLE attributes are attributes which are drawn from the atomic value domains
E.g. Name = {John} ; Age = {23}
• COMPOSITE attributes: Attributes that consist of a hierarchy of attributes
E.g. Address may consists of "Number", "Street" and "Suburb" → Address = {59 + ‘Meek Street' + ‘Kingsford'}
• SINGLE VALUED attributes: Attributes which have only one value for each entity E.g. Name, Age for EMPLOYEE
• MULTIVALUED attributes: Attributes that have a set of values for each entity E.g. Degrees of a person: ‘ BSc' , ‘MIT', ‘PhD'
• DERIVED attributes: Attributes Contain values which are computed from other attributes
Eg. Age can be derived from attribute DateOfBirth. In this situation, DateOfBirth might be known as Stored Attribute


Related Discussions:- Discuss along with examples about several types of er model

Sub query in the update command, Sub query in the UPDATE command : Exam...

Sub query in the UPDATE command : Example :  //Double  the  commission  for  employees,  who  have  got  at  least  2 increments. UPDATE EMP SET COMM = COMM * 2 WHERE

Define decision tree classifiers, Define decision tree classifiers? As ...

Define decision tree classifiers? As the name suggests decision tree classifiers use a tree: Every leaf node has an associated class, and every internal node has a predicate as

Define thomas write rule, Define Thomas write rule Thomas' write rule: ...

Define Thomas write rule Thomas' write rule: The Thomas' write rule is a modification of timestamp-ordering protocol for concurrency control. Assume that transaction T i issue

Database Models, Benefits and Limitations od Data Models?

Benefits and Limitations od Data Models?

Stock market, need requirement analysis for database management of stock ma...

need requirement analysis for database management of stock market

A step-wise distributed database design methodology, A step-wise distribute...

A step-wise distributed database design methodology Following is a step-wise methodology for distributed database design. (1) Examine the nature of distribution. Find out wh

Student, explain exhausitively the problems associated with er diagrams wit...

explain exhausitively the problems associated with er diagrams with ellustrations

Oracle, List and explain the memory constructs of the Oracle 12c databases?...

List and explain the memory constructs of the Oracle 12c databases?

File Management Principles, What are the requirements to ensure the objecti...

What are the requirements to ensure the objectives of file management principle is realized?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd