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Data Warehousing Concepts in SQL: Understanding Star and Snowflake Schemas

Table of Contents Introduction What Is a Data Warehouse? OLTP vs OLAP: The Need for Warehousing Key Components of a Data Warehouse What Is Dimensional Modeling? Facts and Dimensions Explained The...
Kumar Prafull - 0

SQL with APIs and JSON Fields in PostgreSQL: Working with Semi-Structured Data

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SQL for Data Engineering: ETL Concepts and Building Scalable Data Pipelines

Table of Contents Introduction What Is Data Engineering and Why SQL Matters Understanding ETL (Extract, Transform, Load) SQL’s Role in Each ETL Stage Data Sources: Raw Data Ingestion with...
Kumar Prafull - 0

SQL for Data Analysis: Deep Dive into KPIs and Cohort Analysis

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Error Handling in SQL: Managing Exceptions and Ensuring Reliable Transactions

Table of Contents Introduction Why Error Handling Matters in SQL Types of Errors in SQL Syntax Errors vs Runtime Errors Understanding Transaction Errors Rollbacks for Safe Error Recovery Error Handling in...

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Stored Procedures and Functions in SQL: Encapsulating Logic for Reuse and Automation

Table of Contents Introduction What Are Stored Procedures and Functions? Benefits of Using Stored Routines Stored Procedures vs Functions: Key Differences Syntax for Creating Stored Procedures Executing a Stored Procedure Parameters...

Triggers in SQL: Automating Database Behavior

Table of Contents Introduction What Is a Trigger in SQL? Why Use Triggers? Types of Triggers Syntax of a Trigger BEFORE vs AFTER Triggers INSERT, UPDATE, and DELETE Triggers Trigger Events: Row-Level...

Using Constraints in SQL: NOT NULL, UNIQUE, CHECK, and DEFAULT

Table of Contents Introduction What Are Constraints in SQL? Why Use Constraints? NOT NULL Constraint UNIQUE Constraint CHECK Constraint DEFAULT Constraint Combining Multiple Constraints Adding Constraints to Existing Tables Dropping Constraints Naming Constraints for Clarity Column-Level...

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Building a Chat App with Gateway, Rooms, and Events in NestJS

Kumar Prafull -
Real-time chat applications are a perfect use case for WebSockets. In this module, we'll build a basic chat app using NestJS WebSocket Gateways, Socket.IO...

WebSockets in NestJS with @nestjs/websockets

Kumar Prafull -
In the modern web, real-time communication is increasingly becoming a necessity. Whether it's a live chat app, real-time analytics dashboard, multiplayer game, or stock...

Middleware vs Guard for Auth Handling in NestJS

Kumar Prafull -
When building secure applications with NestJS, authentication plays a central role. Two common mechanisms used for request-level processing are Middleware and Guards. Both can...

Using Sessions and Cookies in NestJS: Persistent Login and Secure State Management

Kumar Prafull -
While JWTs are a popular method for authentication in modern APIs, sessions and cookies remain a secure and viable solution — especially in traditional...

Role-Based Access Control (RBAC) and Guards in NestJS

Kumar Prafull -
Controlling access to resources based on user roles is a fundamental security practice in modern application development. In NestJS, Guards offer a clean and...

Refresh Tokens and Token Rotation in NestJS: Secure JWT Authentication

Kumar Prafull -
As you build secure applications with NestJS and JWT authentication, one critical concern is token expiration. Access tokens should have short lifespans for security,...

Passport Strategies in NestJS: JWT, Local, OAuth2, and Google Login

Kumar Prafull -
NestJS integrates seamlessly with Passport.js, a popular Node.js middleware for authentication. Passport provides a rich ecosystem of strategies that you can plug into your...

JWT Authentication in NestJS: Login, Signup, and Protected Routes

Kumar Prafull -
Authentication is a fundamental part of most modern web applications. In this module, you'll learn how to implement JWT (JSON Web Token) based authentication...

Pagination, Filtering, and Query Optimization in NestJS

Kumar Prafull -
When working with APIs that return large datasets, it's essential to provide mechanisms like pagination, filtering, and query optimization. These strategies not only enhance...

Writing Unit and Integration Tests for Services with Database Access in NestJS

Kumar Prafull -
Testing is an essential part of building reliable and maintainable NestJS applications. When working with database-driven services, it's crucial to validate not just isolated...

Database Transactions in NestJS: A Complete Guide

Kumar Prafull -
Database transactions are critical when you need to ensure that a series of operations either all succeed or all fail together. This becomes especially...

Schema Relationships and Migrations in NestJS

Kumar Prafull -
In a relational database, schema relationships define how different tables (entities) are connected to each other. Understanding these relationships is crucial when designing a...
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