In this Subject, I will share my class notes of Entity Relation Diagram, Relational Algebra, Tuple Relational Calculus, Domain Relational Calculus, Normalisation with numerical and practical examples, Indexing, SQL and PL-SQL, Transaction control Management and their protocols. I have included lots of Gate Questions which may helpful for the students for competitive examination like GATE, DRDO, ISRO and GPSC.