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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
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