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SQL for Financial Analytics: Profit & Loss Reporting, Forecasting, and Ratio Analysis

Table of Contents Introduction Importance of SQL in Financial Analysis Core Financial Statements in Data Tables Building a Profit & Loss (P&L) Report in SQL Structuring Accounts: Revenue vs...
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Data Warehousing Concepts in SQL: Understanding Star and Snowflake Schemas

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

Table of Contents Introduction Why JSON Support Matters in Modern SQL PostgreSQL JSON vs JSONB Creating Tables with JSON Fields Inserting JSON Data (from APIs or files) Accessing JSON Properties...
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SQL for Data Engineering: ETL Concepts and Building Scalable Data Pipelines

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Working with JSON in SQL: Storing, Querying, and Manipulating JSON Data

Table of Contents Introduction Why Use JSON in SQL Databases? Storing JSON Data in Tables JSON Data Types and Columns Basic JSON Syntax Inserting JSON Values Retrieving JSON Data Accessing JSON Fields...

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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...

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...

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Redis Pub/Sub with WebSockets for Scalable Messaging in NestJS

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As your real-time application grows, a single WebSocket server may not be able to handle all clients efficiently. In a distributed system where multiple...

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

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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

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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

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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

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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

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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

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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

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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...
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