Database Basics – Beginner NotesFree

Beginner-friendly Database Basics Notes covering SQL, relational databases, NoSQL, database design, and practical database concepts. The material explains databases, DBMS, SQL, tables, primary keys, foreign keys, indexes, relational database fundamentals, schemas, constraints, keys, relationships, and normalization.

The notes include practical SQL commands and examples such as SELECT, INSERT, UPDATE, DELETE, WHERE, ORDER BY, GROUP BY, and JOIN, along with INNER, LEFT, RIGHT, FULL OUTER, and SELF JOINs. It also covers transactions and ACID properties, indexes, views, stored procedures, triggers, NoSQL database types, database security, SQL injection prevention, backup and recovery, RPO/RTO, performance optimization, caching, and connection pooling.

The material also provides an e-commerce database design example, a beginner learning path, and quick interview questions covering primary keys, foreign keys, DELETE vs TRUNCATE, WHERE vs HAVING, normalization, indexes, transactions, and SQL vs NoSQL.