The Online Examination System ER Diagram shows the relationships of the system’s entities that build its database design. ER diagram describes the logical structure of the system’s database or data storage. It is done by identifying the examination management process entities, their properties, and the interactions between them.
The online examination management system database design is sketched out using ER (entity-relationship) diagram. This sketch becomes the actual basis of the system’s data storage that will serve as data destination and source.
ER Diagram for Examination Management System: Details
The table shows the overall description of the ER Diagram for Examination Management System. It has a complete overview of the project’s information.
| Name: | Online Examination Management System ER Diagram |
| Abstract: | The online examination management system ER diagram depicts the relationship between various entities. It can be thought of as a blueprint for your system (project) structure. |
| Diagram: | ER Diagram is also known as Entity Relationship Diagram |
| Tools Used: | Diagraming tools that provide ER diagram symbols. |
| Users: | Train Companies, Passengers, and Crews. |
| Designer: | ITSourceCode.com |
What is Online Examination Management System?
An online examination system is a computer-based test system that may be used to conduct computer-based tests online. This test system doesn’t use as many resources and doesn’t need question papers or answer scripts. It also doesn’t need to schedule exam rooms, coordinate invigilators, or do other things.
This online examination system gives the examination procedure more flexibility and security. Once all of the questions have been submitted, the system can shuffle and assign questions to students in different orders. This reduces the possibility of cheating.
Online Examination System ER Diagram Features
- Examinee’s Management – This function requires the Examinee’s basic information and it needs to be secured. So the ER Diagram design must be able to handle the examinee’s management in Online Examination System.
- Exam Plotting or Making – Exam Plotting or Making generates a lot of data to handle. And to secure the data generated, the database design also shows the part which will handle the Exam that will be made.
- Manage Exam Reports – When the examinee has finished taking the exam, the Online Examination management system must be able to Secure that Information which is why the designed ER Diagram has the portion for that.
- Transaction and Reports Management – About the reports and transactions made are used to track every activity made within the system. And to have a record to look back, the designed ER Diagram for Online Examination system shows how would it secure those records.
What is an ER Diagram?
In DBMS, the ER Diagram of online examination management system is also known as the system’s database design. It is the graphical depiction of relationships between all the entities involved in the system. Its major components are Entities, Attributes, and Relationships.
To build and troubleshoot relational databases, the online examination system ER Diagram is used. It works best with DFD (Data Flow Diagram), which is responsible for data movement. Developing the database design for online examination management system would be much easier with the help of ER diagram.
Importance of ER Diagram
The importance of ER diagram for examination management system is to help in modeling its data storage or database. It is the basis of the project’s database foundation for construction. The online examination system entity-relationship diagram (ERD) also aids in defining the data types to be stored such as their attributes and characteristics.
All other real-world projects are presented with ER Diagrams (database designs). To display the details and attributes of a data store, the er diagram for online examination management system is used in conjunction with its data flow diagram. It visualizes how data is connected generically.
ERD (Entity-relationship diagram) is utilized in software engineering during the planning phase of software development. It aids in the identification of various system constituents and their interrelationships. Online Examination System ERD is also used as the foundation of the examination system DFD (Dataflow Diagram).
ER Diagram of Online Examination System
The ERD or ER Diagram for Online Examination System shows the relationships in each entity and their supposed functions in each relationship. Now here’s the sample ER Diagram of Online Examination System.
Based on the image above, the Entity-Relationship Diagram for Online Examination System is the blueprint of the database development and these are presented in tables. The tables are made to meet the required specification of the system and provide much more specific details of each entity within the system.
The purpose of this ER Diagram is to fully understand how the system handles the data as well as the relationships of tables in the online examination system database design. And if you like to have a reference for your project making, you can have the PDF copy of this Online Examination System ER Diagram.
Online Examination System Database Design
This examination management system database design was made based on online examination requirements. The system can encode the student’s and proctor’s information. Only the admin can access the status and information of the transactions and handle data in managing examinations as well as the exam results records.
The features included in the system ER diagram were the security and monitoring of the online examination management and status and customers’ transactions. These features were also listed and recorded in reports that served as the history of transactions done in the system.
Online Examination System ER Diagram Tables
These tables below provide the complete database table details such as Field Name, Descriptions, data types, and character lengths. Each of these tables represents the characteristics and the attributes of data storage.
The field column presents the names of each database’s attributes, the description column gives the complete thought of each attribute, the type column is their data type and the length is for their character lengths.
Table Name: Examinees
| Field | Description | Type | Length |
| examinee_ID (PK) | Examinee’s ID | Int | 11 |
| name | Examinee’s Name | Varchar | 255 |
| age | Examinee’s Age | Int | 11 |
| contact_number | Examinee’s Contact Number | Int | 11 |
| gender | Examinee’s Gender | Varchar | 255 |
Table Name: Exam
| Field | Description | Type | Length |
| exam_ID (PK) | Exam ID | Int | 11 |
| exam_name | Exam Name | Varchar | 255 |
| description | Exam Description | Text | |
| provider | Exam Provider | Varchar | 255 |
Table Name: Exam Taken
| Field | Description | Type | Length |
| taken_ID (PK) | Exam Taken ID | Int | 11 |
| exam_ID (FK) | Exam ID | Int | 11 |
| examinee_ID (FK) | Examinee ID | Int | 11 |
| date | Date Exam Taken | Date |
Table Name: Exam Requirements
| Field | Description | Type | Length |
| requirement_ID (PK) | Requirement ID | Int | 11 |
| examinee_ID (FK) | Examinee ID | Int | 11 |
| req_name | Requirement Name | Varchar | 255 |
| quantity | Quantity | Int | 11 |
Table Name: Exam Results
| Field | Description | Type | Length |
| result_ID (PK) | Exam Result ID | Int | 11 |
| examinee_ ID (FK) | Examinee ID | Int | 11 |
| taken_ID (FK) | Exam Taken ID | Int | 11 |
| score | score | Int | 11 |
| evaluation | Evaluation | Varchar | 255 |
Table Name: Exam Reports
| Field | Description | Type | Length |
| report_ID | Exam Report ID | Int | 11 |
| report_date | Date Of Report | Date | |
| examinee_ID (FK) | Examinee ID | Int | 11 |
| requirement_ID (FK) | Requirement ID | Int | 11 |
| exam_ID (FK) | Exam ID | Int | 11 |
| taken_ID (FK) | Exam Taken ID | Int | 11 |
The tables given will be the basis for developers on how would they do the online examination management system database design. It has the complete description of the database and they will put this into the program or data storage the same as the names given to each of the tables. They will create a database with the attributes given as well as the value of each attribute.
Online Examination System ER Diagram [PDF]
The ER Diagram for Online Examination Management System in DBMS Pdf provides the information explaining the concepts of the project database. You may apply this information to your capstone project. You can also use it directly or modify its content depending on your project’s requirements.
How to create an Entity-Relationship (ER) Diagram
Time needed: 5 minutes
Steps in building the ER Diagram for Online Examination Management System with Cardinality Ratio.
- Step 1: Familiarize the ER Diagram (Entity Relationship Diagram) Symbols and Cardinality
Entity Relationship Diagram – shows the structure of data types in a project. It uses symbols to clarify its parts and relationships. Their symbols and applications must be familiarized before you build the ER Diagram.
ER Diagram Symbols:
• Field – are the parts of a table that define the entity’s characteristics. In the database that the ERD models, attributes are commonly thought of as rows.
• Keys – is a technique to categorize data qualities. It is used to organize ER diagrams and assist users in modeling their databases to ensure that they are efficient. This is also used to connect different tables in a database.
– Primary Key: identifies a single entity instance which means a unique attribute or set of attributes.
– Foreign Key: is produced when data attributes have one too many relationships with other entities.
ER Diagram Cardinalities:
The styling of a line and its termination demonstrates cardinality and ordinality.
The greatest number of times an instance of one thing can be related to instances of another entity is referred to as cardinality.
While Ordinality refers to the fewest number of times a single entity instance can be linked to another. - Step 2: Finalize the entities included
Start designing your ER Diagram by finalizing the entities that must be included in your online examination management system. This entity is represented by a rectangle, and you’ll want to leave plenty of room for them in future phases so you may add them to your design.
An entity set is a group of similar entities with shared properties. A table or a table’s attribute is an entity in a database management system. As a result, by depicting relationships between tables and their characteristics, an ER diagram displays the whole logical structure of a database. - Step 3: Add the attributes of each entity
After finalizing the entities, think about the qualities you’ll need to characterize each entity. The details of the various entities outlined in a conceptual ER diagram are supplied as attributes. Characteristics of an entity, a many-to-many relationship, or a one-to-one relationship are all examples of attributes. Multivalued attributes can be assigned to several values.
The entity’s attributes were represented by ovals and can be seen in the tables of the online examination management system er diagram. These attributes can be a primary key or a foreign key in the database design of the project. Yoy ER diagram design could also be converted to the database of the system by declaring your right entities and their attributes. - Step 4: Describe the relationships (cardinality) between entities and attributes
To plot relationships between the ERD you will need the entities, their attributes, and relationships. You will base the data structure from the evaluated information to have the exact Entity Relationship Diagram.
A relationship is an association that describes how two entities interact. At the connector’s endpoints, the cardinality is indicated by a crow’s foot. One-to-one, one-to-many, and many-to-many are the three most common cardinal relationships. It’s the maximum number of times an instance of one entity can be linked to instances of another entity.
Conclusion
You have to bear in mind that the simple database design for Online Examination System ER Diagram has a big role in creating the project. This will only be useful for building the project but also in securing that the project will be functional and efficient. All in all, the entity-relationship diagram (ERD) acts as a guide on how to build the database.
ER (entity-relationship) diagram is only one of the diagrams used to design and develop the Examination Management System. Each of the diagrams you design and create will help you in presenting your ideas and impart your abilities.
Creating the ER diagram will help you perceive the back end of the software which will hold all the data that’ll enter and exit the system. To learn more about the ER Diagrams and more, check out the related and recommended articles below.
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