DBMS Concepts

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DBMS ER Model

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Difference

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ER Diagram for College Management System in DBMS

In DBMS, ER diagram for a college management system shows how the databases are connected to each other. It also shows how all the databases are logically related to each other. We can also create an ER diagram by drawing the figure of a different part of the college management system and their properties and how they perform their task. 

We can draw an ER diagram of the college management system by drawing the design of the database. The sketch of the database became the storage of the database where the data comes and goes.

Details College Management System ER Diagram

Now we describe the overall function of the College Management System in the below table. It is a complete overview of the information about the college management project.

NameER Diagram of the College Management System.  
AbstractThe ER Diagram of the College management system shows the relationship between various entities. We can also call it the blueprint of the College management system.  
DiagramWe can also call the ER diagram an Entity Relationship diagram.  
Tool usedThe ER diagram provides some symbol that is known as the diagramming tool.  
UsersThe users of the ER diagram are applications, software, and websites.  

What is College Management System?

A college management system can manage student attendance, enrollment, grade, library material, fees, and the assignment of the college.

College Management System Features

There is some important feature of the college management system. These are as follows.

  1. College management: The college management system manages the college, and the ER diagram provides the basic information. Here is the basic information related to the courses and the program offered by the college.
  2. Student management: In the college management system, the student management feature provides an important role because it collects all the information of the student. With the help of these collected data, the college management system keeps track of all the transactions of students and some other important system details.
  3. Manage courses and subjects: Here, the college admin must provide the details of the courses that assign to each student, and they also have to assign the teacher for each subject.
  4. Manage teachers: The college management system manages all the information of the teachers, class schedule, and more.
  5. Transaction and scheduling management: In the college management system, all the information, like the teacher and student transactions, including subject and timetables.

What is an ER Diagram?

We can also call ER diagram the database design for the college management system project. The ER diagram is like a picture that contains how all the entities are related to each other. The most important part of the ER diagram is Relationships, Attributes, and Entities. 

Importance of ER Diagram

The ER diagram for the project is the foundation for the building of the database of the project. The properties, datatypes, and attributes are defined by the ER diagram.

ER Diagram for College Management System

The ER diagram for the college management system, the system data, and their attributes. The data and the attributes are represented by the table, and the table shows how they are related to each other.

Database design for the College management system:

ER Diagram for College Management System

The above diagram shows the database design for the college management system. This database design shows all the system data, and the output for the user is stored in the database. In DBMS, a good ER diagram is needed for the creation of a college management system.

College Management System ER Diagram Tables

The below table shows all about the field name of the table, description, datatype, and character length. Each table of the ER diagram defines and explains the data storage. 

The field column lists all the attributes of the database that describes each column. The types table of the database shows what kind of data each attribute is, and the length shows how many characters it has.

Table Name: Student

FieldDescriptionTypeLength
stud_ID (PK)Student IDInt11
fnameStudent First NameVarchar255
lnameStudent Last NameVarchar255
genderStudent GenderInt11
ageStudent AgeInt11
contact_addContact AddressInt11
stud_emailStudent EmailVarchar255
stud_passStudent PasswordVarchar255

Table Name: Instructor

FieldDescriptionTypeLength
ins_ID (PK)Instructor IDInt11
fnameInstructor First NameVarchar255
lnameInstructor Last NameVarchar255
genderInstructor GenderInt11
ageInstructor AgeInt11
contact_addContact AddressInt11
ins_emailInstructor EmailVarchar255
ins_passInstructor PasswordVarchar255

Table Name: Course

FieldDescriptionTypeLength
course_ID (PK)Course IDInt11
course_nameCourse NameVarchar30
course_descCourse DescriptionVarchar30
school_yrSchool YearInt11

Table Name: Subjects

Field      DescriptionTypeLength
sub_ID (PK)Subject IDInt11
nameSubject NameVarchar255
course_ID (FK)Course IDInt11

Table Name: Schedules

FieldDescriptionTypeLength
sched_ID (PK)Schedule IDInt11
course_ID (FK)Course IDInt11
sub_ID (FK)Subject IDInt11
ins_ID (FK)Instructor IDInt11
stud_ID (FK)Student IDInt11
dayDay of scheduleDate
time_startStarting TimeTime
time_endTime EndedTime

Table Name: Transactions

FieldDescriptionTypeLength
trans_ID (PK)Transaction IDInt11
trans_nameTransaction NameInt11
stud_ID (FK)Student IDInt11
trans_dateTransaction DateDate

With the help of the above tables, we can set up the database for the college management system. It provides the full description of the database with its table names. They will enter all the values and attributes for the database in the table.

How to Create ER Diagram

We can create the ER diagram for the table just in 5 minutes. There are some steps, and with the help of these steps, we can build the ER diagram for the college management system project. The steps are as below.

Step 1:

We have to familiarize ourselves with the entity relationship diagram cardinality and symbols. Then we have to show the data structure for the project in the entity relationship diagram. The symbol of the entity relationship diagram shows how they fit together. Before making the ER diagram, we should properly know the meaning of all the symbols and how to use all of them symbols.

Symbol of entity relationship diagram:

  1. Fields: This entity shows how the different types of data are used together for a project. The symbol is used to show how the part of the project is working.
  2. Key: It is a type of technique that is used to categorize the quality of the data. There are two types of keys available for the database. These are as follows.
    • Primary key: It is a set of unique properties that are used for finding the specific entity.
    • A foreign key: It is a type of key made up of a piece of data with too many links to other things.

Step 2: Finalize the entities included

Start making your ER Diagram by deciding on all the parts your college management system must have. You’ll need to leave the area in your design for these rectangles to be included later.

Step 3: Add the attributes of each entity

After you’ve decided on the entities, think about the traits you’ll need for each one. In a conceptual ER diagram, the details of the different entities are given as attributes. Attributes are things like a thing’s traits, a many-to-many relationship, or a one-to-one relationship. Attributes with multiple values can be given more than one value.

Step 4: Describe the relationships (cardinality) between entities and attributes

You will need the entities, their attributes, and the relationships between them in order to plot the relationships between the ERD. To get the right entity relationship diagram, you will use the information you gathered to build the data structure.

Conclusion

You need to know how the College Management System was designed and built using diagrams. With the help of an ER diagram will help you make a system that works well. Making it will help you understand how the software works behind the scenes. This is where all the data that goes in and out of the system will be stored.