DBMS Concepts

DBMS Tutorial Components of DBMS. Applications of DBMS The difference between file system and DBMS. Types of DBMS DBMS Architecture DBMS Schema Three Schema Architecture. DBMS Languages.

DBMS ER Model

ER model: Entity Relationship Diagram (ERD) Components of ER Model. DBMS Generalization, Specialization and Aggregation.

DBMS Relational Model

Codd’s rule of DBMS Relational DBMS concepts Relational Integrity Constraints DBMS keys Convert ER model into Relational model Difference between DBMS and RDBMS Relational Algebra DBMS Joins

DBMS Normalization

Functional Dependency Inference Rules Multivalued Dependency Normalization in DBMS: 1NF, 2NF, 3NF, BCNF and 4NF

DBMS Transaction

What is Transaction? States of transaction ACID Properties in DBMS Concurrent execution and its problems DBMS schedule DBMS Serializability Conflict Serializability View Serializability Deadlock in DBMS Concurrency control Protocols

Difference

Difference between DFD and ERD

Misc

Advantages of DBMS Disadvantages of DBMS Data Models in DBMS Relational Algebra in DBMS Cardinality in DBMS Entity in DBMS Attributes in DBMS Data Independence in DBMS Primary Key in DBMS Foreign Key in DBMS Candidate Key in DBMS Super Key in DBMS Aggregation in DBMS Hashing in DBMS Generalization in DBMS Specialization in DBMS View in DBMS File Organization in DBMS What Is A Cloud Database What Is A Database Levels Of Locking In DBMS What is RDBMS Fragmentation in Distributed DBMS What is Advanced Database Management System Data Abstraction in DBMS Checkpoint In DBMS B Tree in DBMS BCNF in DBMS Advantages of Threaded Binary Tree in DBMS Advantages of Database Management System in DBMS Enforcing Integrity Constraints in DBMS B-Tree Insertion in DBMS B+ Tree in DBMS Advantages of B-Tree in DBMS Types of Data Abstraction in DBMS Levels of Abstraction in DBMS 3- Tier Architecture in DBMS Anomalies in Database Management System Atomicity in Database Management System Characteristics of DBMS DBMS Examples Difference between Relational and Non-Relational Databases Domain Constraints in DBMS Entity and Entity set in DBMS ER Diagram for Banking System in DBMS ER Diagram for Company Database in DBMS ER Diagram for School Management System in DBMS ER Diagram for Student Management System in DBMS ER Diagram for University Database in DBMS ER Diagram of Company Database in DBMS Er Diagram Symbols and Notations in DBMS How to draw ER-Diagram in DBMS Integrity Constraints in DBMS Red-Black Tree Deletion in DBMS Red-Black Tree Properties in DBMS Red-Black Tree Visualization in DBMS Redundancy in Database Management System Secondary Key in DBMS Structure of DBMS 2-Tier Architecture in DBMS Advantages and Disadvantages of Binary Search Tree Closure of Functional Dependency in DBMS Consistency in Database Management System Durability in Database Management System ER Diagram for Bank Management System in DBMS ER Diagram for College Management System in DBMS ER Diagram for Hotel Management System in DBMS ER Diagram for Online Shopping ER Diagram for Railway Reservation System ER Diagram for Student Management System in DBMS Isolation in DBMS Lossless Join and Dependency Preserving Decomposition in DBMS Non-Key Attributes in DBMS Data Security Requirements in DBMS DBMS functions and Components What is Homogeneous Database? DBMS Functions and Components Advantages and Disadvantages of Distributed Database

ER Diagram of Company Database in DBMS

Entity Relationship Diagram

Entity Relationship Diagrams, or ER Diagrams for short, are diagrams that show the relationships among entity sets that are stored in databases. Alternatively said, ER diagrams assist in describing the logical layout of databases. Entities, attributes, and relationships are the three fundamental ideas on which ER diagrams are based. Entities, traits, and relationships are all represented as rectangles, ovals, and diamond shapes in ER diagrams.

At first impression, a flowchart and an ER diagram are similar. The ER Diagram is a particular model, nevertheless, because of the multiple specific symbols and their associated meanings. The entity framework architecture is shown in the ER Diagram. The relationship between the entities that will be recorded in a database is shown in an entity relationship diagram (ER Diagram).

The ER Diagram illustrates how a database is structured. With the aid of specialized symbols, it serves as a foundation for defining the connections between database entities. Entities, attributes, and relationships make up the core three elements of an ER diagram.Entity-Relationship Diagrams, also referred to as ER Diagrams, are used to examine database structure. It demonstrates the connections between entities and their characteristics. An ER Model gives people a way to communicate.

Er Diagram for Company Database

The following is an explanation of the company's ER diagram:

  • The business has numerous departments.
  • There may be numerous locations for each department.
  • A department's name, D no, and location are used to identify it.
  • A manager is in charge of a specific department.
  • Numerous projects are connected to each department.
  • An employee's name, ID, address, DOB, and date of joining are used to identify them.
  • An employee only works in one department, however they may work on multiple projects at once.
  • We also record how many hours a worker spends on a particular project.
  • Each employee has a dependent, who is also known by their D name, gender, and relationship.

The company's ER diagram is described as follows:

  • The company has many departments.
  • Multiple locations may exist for each department.
  • A name, D no, and location are used to identify departments.
  • A manager has control over a specific department.
  • There are various projects connected to each department.
  • Name, ID, address, DOB, and date of joining are used to identify employees.
  • While an individual only works in one department, they may be involved in multiple projects.
  • We also record how many hours a certain employee spends working on a particular project.
  • Every employee has a dependent, and each dependent has a D name, a gender, and a relationship.
Er Diagram for Company Database

Relationships are:

  • Employees work in departments, however only one employee can work in many departments at the same time.
  • Manager manages a department; employee reports to the manager of the department, who also keeps track of the employee's joining date.
  • Department has numerous projects. However, one project cannot fall under multiple departments.
  • Employee works on project - One employee works on a variety of projects, and the hours worked on each project are tracked.
  • Each employee has dependents, according to the employee. There is only one employee reliant on each dependent.

Conclusion

         Entity Relationship Diagrams, or ER Diagrams for short, are diagrams that show the relationships among entity sets that are stored in databases. Alternatively said, ER diagrams assist in describing the logical layout of databases. Entities, attributes, and relationships are the three fundamental ideas on which ER diagrams are based. Entities, traits, and relationships are all represented as rectangles, ovals, and diamond shapes in ER diagrams.

At first impression, a flowchart and an ER diagram are similar. The ER Diagram is a particular model, nevertheless, because of the multiple specific symbols and their associated meanings. The entity framework architecture is shown in the ER Diagram. The relationship between the entities that will be recorded in a database is shown in an entity relationship diagram (ER Diagram).

The ER Diagram illustrates how a database is structured. With the aid of specialized symbols, it serves as a foundation for defining the connections between database entities.Entity-Relationship Diagrams, also referred to as ER Diagrams, are used to examine database structure. It demonstrates the connections between entities and their characteristics. An ER Model gives people a way to communicate.