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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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Developer & QA Accessibility Checklist

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✅ Semantic HTML Use correct semantic elements (<header>, <nav>, <main>, <footer>, etc.). Prefer native HTML controls over custom ARIA widgets. Use correct heading hierarchy (<h1>, <h2>, etc.)...

Accessibility (A11y) Expert Level Deep Dive

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1. Accessibility Beyond the Screen Reader: Broader Context Cognitive Accessibility: Simplify navigation and interactions (e.g., avoid complex multi-step processes). Use plain language and minimize memory load (good...

Accessibility and WCAG Guidelines (Advanced Level)

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Table of Contents Deep Dive into Web Accessibility Understanding WCAG 2.1 and 2.2 Updates Advanced Perceivable Techniques Advanced Operable Techniques Advanced Understandable Techniques Advanced Robust Techniques Using ARIA Effectively (Beyond Basics) Accessibility...

Accessibility and WCAG Guidelines (Intro Level)

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Table of Contents What is Accessibility (a11y)? Why Accessibility Matters Introduction to WCAG Four Principles of WCAG (POUR) Basic Accessibility Best Practices Common Mistakes to Avoid Conclusion 1. What is Accessibility (a11y)? Accessibility,...

Dark Mode with CSS Variables and Media Queries

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Table of Contents Introduction to Dark Mode Benefits of Using CSS Variables Setting Up Light and Dark Themes Detecting System Theme with Media Queries Switching Themes with JavaScript Accessibility Considerations Conclusion 1....

Creating Tooltips, Modals, and Accordions in HTML & CSS

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Table of Contents Introduction to Tooltips, Modals, and Accordions Creating Tooltips in HTML & CSS Tooltip Structure Styling Tooltips Animating Tooltips Building Modals with HTML & CSS Modal Structure Modal Visibility Control Modal...

CSS Clip-Path and Shape Manipulation

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Table of Contents Introduction to CSS Clip-Path Syntax and Basic Usage Basic Shapes with Clip-Path Polygonal Shapes and Custom Clip Paths Animating Clip-Path for Dynamic Effects Advanced Clip-Path Techniques (Multiple...

Custom Cursors and Scrollbars in CSS

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Table of Contents Introduction to Custom Cursors Creating Custom Cursors with CSS Cursor Styles and Their Usage Customizing Scrollbars with CSS Styling Scrollbars in WebKit Browsers Cross-Browser Compatibility for Custom...

CSS Shadows, Filters, and Blurs

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Table of Contents Introduction to CSS Shadows Box Shadow Property: Syntax and Examples Text Shadow Property: Syntax and Examples Introduction to CSS Filters Common CSS Filters and Their Usage Using...

Transitions and Animations in CSS

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Table of Contents Introduction to CSS Transitions Transition Properties and Examples Introduction to CSS Animations Keyframes in CSS Animations Animation Properties and Examples Transition vs Animation: Key Differences Advanced Animation Techniques Browser...

Pseudo-classes and Pseudo-elements in CSS

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Table of Contents What Are Pseudo-classes and Pseudo-elements? The Difference Between Pseudo-classes and Pseudo-elements Commonly Used Pseudo-classes Commonly Used Pseudo-elements Combining Selectors with Pseudo-classes and Pseudo-elements Use Cases and Practical...

Building a Mobile-First Layout in CSS

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Table of Contents What is a Mobile-First Layout? Why Use the Mobile-First Approach? Key Principles of Mobile-First Design CSS Strategies for Mobile-First Development HTML Structure of a Sample Layout Building...
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