How to identify entity from a given problem

DBMSDatabaseMySQL

Entity in DBMS can be a real-world object with an existence. To identify entity from a given problem, follow the below given tips −

Under the problem description, try to find the entity.

  • Search for nouns, like Teacher, Doctor, etc.
  • Classify nouns to get a wider picture about the entities.
  • Read the problem description repeatedly.
  • Entities are like Persons, Students, Teachers, Courses.
  • Entities has attributes, that properties describing it, for example, for Professor entity, the attributes are  Professor_Name, Professor_Address, Professor_Salary, etc

For example,

Problem Description

Hospital has doctors and patients. Patients visit the hospital to get a consultation from the doctor. Doctor may suggest tests to examine the condition of the patient.

Entities

The following are the entities −

  • Hospital
  • Patient
  • Doctor
  • Tests

Attributes

  • The attributes for Hospital Entity: Hospital_Name, Hospital_Location, Hospital_Phone, etc.
  • The attributes for Patient Entity: Patient_Id, Patient_Name, Patient_Age, Patient_VisitDate, etc.
  • The attributes for Doctor Entity: Doctor_Id, Doctor_Name, Doctor_Specialization, etc.
  • The attributes for Tests Entity: Tests_Name, Tests_Date, Tests_Result, etc.
raja
Published on 03-Jul-2018 20:26:13
Advertisements