Get premium membership and access questions with answers, video lessons as well as revision papers.

Discuss types of computer ER Model concepts.

      

Discuss types of computer ER Model concepts.

  

Answers


Jim
a)Entities.
Entities are specific objects or things in the mini-world that are represented in the database. For example the EMPLOYEE John Smith, the Research DEPARTMENT, the ProductX PROJECT.
-A specific entity will have a value for each of its attributes. For example a specific employee entity may have Name='John Smith', SSN='123456789', Address ='731, Fondren, Houston, TX', Sex='M', BirthDate='09-JAN-55‘
b)Attributes.
-Attributes are properties used to describe an entity. For example an EMPLOYEE entity may have a Name, SSN, Address, Sex, BirthDate.
-Each attribute has a value set (or data type) associated with it – e.g. integer, string, subrange, enumerated type, …

jim items answered the question on March 12, 2019 at 14:48


Next: Name two hormones involved in regulation of sugar in human body.
Previous: Outline the main problems facing computer modelling tools.

View More Computer Science Questions and Answers | Return to Questions Index


Learn High School English on YouTube

Related Questions