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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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Access Modifiers: Public, Private, Protected

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Table of Contents Introduction Understanding Access Modifiers in TypeScript What are Access Modifiers? Types of Access Modifiers Public Access Modifier Default Behavior Example of Public Access Modifier Private Access Modifier How It Works Example...

Classes in TypeScript: Constructors and Members

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Table of Contents Introduction Understanding Classes in TypeScript What is a Class? Defining a Basic Class Class Members: Properties and Methods Defining Properties Defining Methods Access Modifiers: Public, Private, and Protected The Constructor...

Index Signatures and Dynamic Object Typing in TypeScript

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Table of Contents Introduction Understanding Index Signatures What is an Index Signature? Defining Index Signatures Common Use Cases Limitations of Index Signatures Dynamic Object Typing Using Record Type for Dynamic Objects Using Index...

Readonly and Optional Object Properties in TypeScript

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Table of Contents Introduction Understanding readonly Properties Basic Usage of readonly Readonly Arrays Preventing Property Re-assignment Understanding Optional Properties Basic Usage of Optional Properties Optional Properties with Interfaces Handling Undefined in Optional Properties Combining...

Typing Object Structures and Nested Objects in TypeScript

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Table of Contents Introduction Typing Object Structures Basic Object Typing Optional and Required Properties Read-Only Properties Typing Nested Objects Nested Object Structures Accessing Nested Properties Type Inference in Object Structures Using Interfaces with Object...

Arrow Functions vs Regular Functions (with Typing)

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Table of Contents Introduction to Arrow Functions and Regular Functions Differences Between Arrow Functions and Regular Functions Syntax Comparison The this Keyword The Arguments Object Arrow Functions and Typing in...

The this Context in Functions

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Table of Contents Introduction to this in JavaScript and TypeScript Understanding the Behavior of this in Functions In Global Context In Object Methods In Constructor Functions Arrow Functions and this Explicit...

Function Overloading in TypeScript

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Table of Contents Introduction to Function Overloading Syntax for Function Overloading Basic Syntax Overloading Signatures Implementing the Overloaded Function Use Cases for Function Overloading Best Practices for Function Overloading Function Overloading vs....

Optional, Default, and Rest Parameters in TypeScript

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Table of Contents Introduction Optional Parameters Syntax for Optional Parameters Use Cases for Optional Parameters Default Parameters Syntax for Default Parameters Use Cases for Default Parameters Rest Parameters Syntax for Rest Parameters Use Cases...

Typing Functions: Parameters and Return Values

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Table of Contents Introduction Function Signatures in TypeScript Typing Function Parameters Basic Parameter Types Optional Parameters Default Parameters Rest Parameters Typing Function Return Values Explicit Return Type Implicit Return Type Arrow Functions and Type Inference Function...

Interfaces vs Type Aliases: In-depth Comparison

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Table of Contents Introduction What Are Interfaces in TypeScript? Basic Syntax and Use Case Interface Declaration Merging What Are Type Aliases in TypeScript? Basic Syntax and Use Case Flexible Types with...

Interfaces: Building Contracts in TypeScript

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Table of Contents Introduction What Are Interfaces in TypeScript? Basic Syntax of Interfaces Example: Defining an Interface Why Use Interfaces? Structuring Code with Interfaces Benefits of Using Interfaces Extending Interfaces Syntax for Extending...
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