"Relational Database Model"

Computer Science
Tutor: None Selected Time limit: 1 Day

  • Describe the main entities or objects of the business function / operation. Specify the attribute that would be the primary key for each entity, and provide a rationale for why you selected such an attribute.
Jul 5th, 2015

Thank you for the opportunity to help you with your question!

1) In the Standard Generalized Markup Language ( SGML ), an entity is a specific character string that has the effect of causing a formatting program (such as a print formatter or a Web browser - which formats for a display screen) to select and present a particular character or notation. In this usage, an entity is a certain string of characters that together specify a unique font to be selected and displayed or printed. A word was needed for such a character string and "entity" came in handy. In HTML (which is a usage of SGML), each special entity or character string is given a name and the entities are therefore called "named entities."

2) In relation to a database , an entity is a single person, place, or thing about which data can be stored.

3) In data modeling (a first step in the creation of a database), an entity is some unit of data that can be classified and have stated relationships to other entities.

4) In the Open Systems Interconnection ( OSI ) model of network communication, an entity is an active element within a subsystem that communicates with other entities using a defined protocol.

5) In IBM's RACF security product, an entity is a user, group, or resource that is defined to RACF.

6) In FORTRAN , almost every program element is referred to as an entity, such as a procedure, an operator, an interface block, an input-output unit, a symbolic constant, and a statement label.


Please let me know if you need any clarification. I'm always happy to answer your questions.
Jul 5th, 2015

  • Determine whether the relationships between each of the chosen entities are one-to-one, one-to-many, or many-to-many relationships. Justify your response.

Jul 5th, 2015

the following are the relationships for the above entities

1 one-to-many.

2 one-to-one, 

3 one-to-one,

4 one-to-many, 

5 one-to-many, 

Jul 5th, 2015

  • Explain the key manner in which the business function / operation and the business rules associated with that business function / operation support the relationships mentioned above. Also, explain the fundamental ways in which the relationships could change, based on the interpretation of the given business rules.

Jul 5th, 2015

kindly post it as a new question. thank you.

Jul 5th, 2015

i did

Jul 5th, 2015

i can not see it please repost. thank you

Jul 5th, 2015

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Jul 5th, 2015
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Jul 5th, 2015
Dec 8th, 2016
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