RDBMS

 An RDBMS (Relational Database Management System) is a type of database management system that stores data in tables, with each table consisting of rows and columns. It organizes and manages data in a way that allows users to easily retrieve, update, and manage data through a relational structure.

Key Features of RDBMS:

1. Tables: Data is stored in tables. Each table consists of rows (records) and columns (fields).
2. Primary Key: A unique identifier for each row in a table, ensuring that no two rows are identical.
3. Foreign Key: A column in one table that refers to the primary key of another table, establishing a relationship between them.
4. SQL: Structured Query Language is used to query and manage the data in an RDBMS.

Simple Example:

1. Creating a Table for Employees:

   
   CREATE TABLE Employees (
       EmployeeID INT PRIMARY KEY,
       FirstName VARCHAR(50),
       LastName VARCHAR(50)
   );
   

2. Inserting Data:

   
   INSERT INTO Employees (EmployeeID, FirstName, LastName)
   VALUES (1, 'John', 'Doe'), (2, 'Jane', 'Smith');
   

3. Querying Data:

   
   SELECT * FROM Employees;
   

This would return:

EmployeeID | FirstName | LastName
---------------------------------
1          | John      | Doe
2          | Jane      | Smith

How It Works:

• Tables store data in rows and columns.
• Primary Key ensures each record is unique.
• Foreign Key links data across tables.
• SQL helps interact with the data: adding, updating, or retrieving information.

Benefits of RDBMS:

• Data Integrity: Ensures data is accurate and consistent.
• Flexibility: Allows complex queries to be run using SQL.
• Relationships: Establishes connections between different tables.

In simple terms, an RDBMS is a system that helps you store, organize, and manage data in an easy-to-understand tabular format while ensuring data consistency and providing tools to work with that data.