2.3- ER Model Database Basic Concept And Terminology | ER Model In DBMS | entities in database
2.3- ER Model Database Basic Concept And Terminology | ER Model In DBMS | entities in database
entity relationship database
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Basic concepts
1 Enterprise Enterprise refers to any kind of organization.
Ex. Colleges, schools, banks, any company etc.
2 Entity Entity refers to an “object” or “thing” in real world. Object may be any person, place, event etc.
Ex. Students of colleges and schools, loans in banks, employees in any company etc.
3 Attributes
These are the characteristics of any entity.
Ex., (i) A student can be described by his name, age, address, height, class etc.
(ii) Loans can be described by their types such as house loan, car loan etc.
(iii) Employees in any company can be described by their Employee ID, name, department, designation etc.
(iv) A car can be described by his color, model, company etc.
4 Value Value is the information or data which is stored in attributes of any entity.
5 Entity Sets All the entities having same attributes make an entity set.
6 Domain Domain or value set is the set of all values or information about any attribute.
Ex. Consider the student table shown in Figure 2.1. It describes the basic concepts
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2.1- Introduction To E-R Model In DBMS | What Is E-R Model In DBMS | Entity Relationship Model DBMS • 2.1- Introduction To E-R Model In DBM...
2.2- What Is An Entity Exactly In E-R- Model in DBMS ? | What Is An Entity In DBMS | NET GATE DBMS • 2.2- What Is Entities In Database | W... Notes Link:
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