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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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Working with Asynchronous JavaScript: Promises and Async/Await

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Mastering Asynchronous Programming in JavaScript Asynchronous programming is a powerful feature of JavaScript that allows developers to handle tasks like fetching data, reading files, or...

Working with JSON and LocalStorage in JavaScript

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Storing Data in the Browser and Handling JSON JavaScript offers powerful mechanisms for storing data in the browser and exchanging it between applications. Two of...

JavaScript Event Loop, Call Stack, and Concurrency Explained

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Understanding How JavaScript Executes Code Asynchronously If you've ever wondered how JavaScript handles multiple tasks—like fetching data while still responding to user interactions—this module is...

JavaScript Modules – import, export, and Code Organization

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Modular JavaScript: Writing Clean, Maintainable, and Scalable Code As JavaScript applications grow in size and complexity, organizing code into modules becomes essential. ES6 introduced a...

Error Handling in JavaScript – Writing Robust and Safe Code

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Understanding Errors and Exception Handling in JavaScript No matter how carefully we write our code, errors are inevitable. Proper error handling is crucial to make...

Modern JavaScript – ES6+ Features You Should Know

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Unlocking the Power of ES6+ in JavaScript With the release of ECMAScript 2015 (commonly known as ES6) and subsequent updates (ES7 through ES2024+), JavaScript has...

Scope, Hoisting & Closures in JavaScript

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Understanding Scope, Hoisting, and Closures in JavaScript These three concepts — scope, hoisting, and closures — form the foundation of how JavaScript code is interpreted...

Working with Dates and Times in JavaScript

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Mastering Dates and Times in JavaScript Handling dates and times is a common task in any application — whether you're showing timestamps, calculating durations, or...

Numbers and Math in JavaScript

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Working with Numbers and Math in JavaScript Numbers are one of the core data types in JavaScript and are heavily used in everything from UI...

Strings and Template Literals in JavaScript

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Mastering Strings and Template Literals in JavaScript Strings are one of the most commonly used data types in JavaScript. Whether you’re displaying messages, handling user...

Object-Oriented JavaScript (OOP in JS)

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Mastering Object-Oriented Programming in JavaScript Object-Oriented Programming (OOP) is a powerful programming paradigm that focuses on organizing code into reusable and logical components called objects....

Working with the JavaScript DOM (Document Object Model)

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Introduction to the DOM in JavaScript The Document Object Model (DOM) is a programming interface provided by the browser that allows developers to interact with...
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