DBMS
A Database Management System (DBMS) is software used to store, organize, and manage data efficiently. It enables users to create, retrieve, update, and delete data from databases. DBMS ensures data security, consistency, and easy access to information.
A Database Management System (DBMS) is a software system that manages databases in an organized manner.
It acts as an interface between users and the database, making data handling easier.
DBMS allows efficient storage, retrieval, insertion, deletion, and modification of data.
It reduces data redundancy and improves data consistency and integrity.
Security features help protect sensitive information from unauthorized access.
Popular DBMS examples include MySQL, Oracle, SQL Server, and PostgreSQL.
What You'll Learn
Introduction to Databases
Introduction to Databases: DBMS vs File Systems, Characteristics, Advantages & Disadvantages
A beginner-friendly introduction to databases that contrasts the old file-based approach with a mod…
34 minData Models in DBMS: Hierarchical, Network, Relational, the Three-Schema Architecture & Data Independence
A detailed introduction to how databases describe data. It compares the three record-based data mod…
36 minEntity-Relationship (ER) Model
Entity-Relationship (ER) Model in DBMS
A comprehensive, beginner-to-advanced walkthrough of the ER Model in DBMS — entities and entity set…
44 minCardinality in DBMS
A complete, example-driven guide to cardinality in the Entity-Relationship model. It explains conne…
31 minConverting an ER Model to a Relational Schema
A complete, example-driven walkthrough of turning an Entity-Relationship diagram into a buildable r…
45 minDesigning an ER Diagram for a University Research Database
A complete, step-by-step walkthrough that turns a university research brief into a basic ER diagram…
31 minRelational Model & Relational Algebra: Select, Project, Join, Divide
A complete, example-driven guide to the relational model and relational algebra. It explains the st…
45 minSQL
SQL Basics Practice: DDL & DML Commands with Constraints
A hands-on SQL tutorial covering the DDL and DML command families — CREATE TABLE with constraints (…
33 minAdvanced SQL Practice: Aggregate Functions, GROUP BY, HAVING, and Nested Subqueries
A practice-first SQL tutorial built on one tiny, hand-verifiable dataset with deliberately planted …
36 minSet Operators, Views, Indexes & Joins in SQL
A hands-on DBMS tutorial covering the three SQL set operators (UNION, INTERSECT, EXCEPT), Views, In…
39 minInteractive SQL Join Playground — Build Queries with WHERE & AND, See Live Results
A hands-on, no-backend SQL join simulator you embed directly in a web page. Learners select two or …
23 minNested Queries & Sub-queries in SQL
A hands-on DBMS tutorial on SQL sub-queries and nested queries, taught on one small employees/depar…
32 minDCL in SQL: GRANT and REVOKE — A Practice-Driven DBMS Tutorial
A hands-on DBMS tutorial on Data Control Language, covering everything needed to manage database pe…
24 minFunctional Dependencies & Normalization
Closure, Covers & Minimal Cover: Solved Practice Problems
A practice-driven worksheet on functional-dependency closures and covers. It drills attribute closu…
26 minFunctional Dependencies Explained: Full, Partial & Transitive
A concept-first guide to functional dependencies in DBMS. It defines X → Y, gives a four-question f…
22 minFirst Normal Form (1NF) in DBMS
A comprehensive guide to First Normal Form, explained from both academic and industry perspectives.…
20 minSecond Normal Form (2NF): Fixing What 1NF Left Behind
A comprehensive guide to Second Normal Form, explained from academic and industry perspectives. It …
23 minFunctional Dependencies & Third Normal Form (3NF)
A beginner-to-pro DBMS tutorial that starts with functional dependencies and quick recaps of 1NF an…
34 minDatabase Normalization Made Simple: 1NF, 2NF & 3NF Solved Step by Step
A complete, worked tutorial that normalizes three classic DBMS assignment tables — Employee–Project…
46 minBCNF in DBMS — 3NF vs BCNF Explained Simply
A focused DBMS tutorial that recaps functional dependencies and 3NF, then exposes 3NF's blind spot:…
22 minFourth Normal Form (4NF) — Killing the Multi-Valued Explosion BCNF Can't See
A focused DBMS tutorial that recaps 3NF, then exposes the redundancy even 3NF and BCNF can't remove…
25 minFifth Normal Form (5NF) — Join Dependencies and the Last Step of Normalization
A focused DBMS tutorial that recaps 4NF, then exposes its limitation: multi-valued dependencies onl…
34 minTransactions and Concurrency:
Transactions & Concurrency: Transaction States and ACID Properties
A practice-oriented DBMS tutorial covering what a transaction is, the read/write/commit/rollback op…
17 minSerializability in DBMS: Conflict Serializable Schedules
A complete tutorial on conflict serializability covering schedules (serial, non-serial, serializabl…
38 minView Serializability in DBMS: Blind Writes, Examples, and Solved Numericals
A complete tutorial on view serializability in DBMS covering the three view-equivalence rules (init…
37 minSchedules in DBMS: Serial, Non-Serial, and Cascadeless Schedules
A comprehensive tutorial on DBMS schedules covering serial schedules (safe but slow, n! orderings),…
29 minConcurrency Control in DBMS: Locking and Two-Phase Locking (2PL)
A tutorial on lock-based concurrency control covering shared/exclusive locks, the compatibility mat…
30 minDatabase Indexing, Hashing & B+-Trees — A Visual DBMS Tutorial
A comprehensive DBMS tutorial on database indexing structures. It explains the anatomy of an index,…
44 min