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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...
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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...
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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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Repository Pattern and Working with Entities in NestJS

Kumar Prafull -
The Repository Pattern is a structural pattern that provides an abstraction layer between the data access logic and business logic in your application. By...

Connecting to PostgreSQL with TypeORM or Prisma in NestJS

Kumar Prafull -
Connecting to a PostgreSQL database is a fundamental part of many web applications. In NestJS, there are several libraries and ORMs (Object-Relational Mappers) available...

Creating Reusable Libraries and Shared Modules in NestJS

Kumar Prafull -
In large-scale applications, code reuse and modularization are key factors in ensuring maintainability and scalability. NestJS, being built on top of TypeScript and leveraging...

Working with HttpModule and RESTful APIs in NestJS

Kumar Prafull -
In modern web development, RESTful APIs are an essential part of creating robust applications. They provide a standardized way for clients to communicate with...

Understanding Async Programming and Promises in NestJS

Kumar Prafull -
Asynchronous programming is a critical concept in JavaScript, and it plays a significant role in server-side applications built with NestJS. As NestJS is based...

Logging with NestJS Logger and Custom Loggers

Kumar Prafull -
Logging is a crucial part of any application, and NestJS provides a built-in logging mechanism that can be easily integrated into your application. In...

Request Lifecycle and Execution Context in NestJS

Kumar Prafull -
In NestJS, understanding the request lifecycle and the execution context is essential for developing robust and efficient applications. The request lifecycle is the series...

Guards: Implementing Role-Based Access Control in NestJS

Kumar Prafull -
In NestJS, guards are used to protect routes by determining whether the request should be allowed to proceed. Guards can be used for a...

Interceptors: Transforming and Logging Responses in NestJS

Kumar Prafull -
In NestJS, interceptors are used to modify the response returned by a route handler. They allow you to execute additional logic before the final...

Middleware: Preprocessing Requests in NestJS

Kumar Prafull -
Middleware in NestJS is a powerful concept that allows you to execute logic before or after handling incoming HTTP requests. Middleware can be used...

Exception Filters: Centralized Error Handling in NestJS

Kumar Prafull -
In any application, error handling is critical for ensuring that users receive meaningful feedback when things go wrong. In NestJS, exception filters are a...

Using Pipes for Transformation and Validation in NestJS

Kumar Prafull -
In NestJS, pipes are a powerful and flexible mechanism for handling data transformations and validation. They allow you to manipulate data, validate inputs, and...
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