Class 11th Informatics Practices Notes: Exam Preparation Made Easy Unit-3
Unit 3: Database concepts and the Structured Query Language *Introduction to Database Concepts* - A database is a collection of organized data that can be easily accessed, managed, and updated. - Data is a collection of raw facts and figures, whereas information is the processed data that has meaning and value. *Need for Database Management Systems* - To store and manage large amounts of data efficiently - To provide a structured and organized way of storing data - To ensure data accuracy, completeness, and consistency - To provide a secure and controlled access to data - To support multiple users and applications *Types of Databases* - Relational Databases (RDBMS): uses tables to store data - Hierarchical Databases: uses a tree-like structure to store data - Network Databases: uses a graph-like structure to store data - Object-Oriented Databases: uses objects to store data *Database Management System (DBMS)* - A software system that manages and controls access to a database - Provi