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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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Static, Final, and Initialization Blocks

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Table of Contents Introduction to Static, Final, and Initialization Blocks The Static Keyword in Java Static Variables Static Methods Static Blocks The Final Keyword in Java Final Variables Final Methods Final Classes Initialization Blocks...

Encapsulation and Access Modifiers

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Table of Contents Introduction to Encapsulation Benefits of Encapsulation How Encapsulation Works in Java Access Modifiers in Java Public Private Protected Default (Package-Private) Choosing the Right Access Modifier Encapsulation in Action: Code Examples Summary 1. Introduction...

Abstraction and Interfaces in Java

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Table of Contents Introduction to Abstraction Types of Abstraction in Java Abstract Classes Interfaces Abstract Classes: Deep Dive Syntax and Usage Abstract vs Concrete Methods Constructors and Abstract Classes Interfaces: Deep Dive Syntax and...

Polymorphism – Overriding and Dynamic Binding in Java

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Table of Contents Introduction to Polymorphism Types of Polymorphism Compile-time Polymorphism (Method Overloading) Runtime Polymorphism (Method Overriding) Method Overriding Dynamic Binding Benefits of Polymorphism Polymorphism in Action: Examples Common Pitfalls and Best Practices Summary 1....

Inheritance and the super Keyword in Java

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Table of Contents Introduction to Inheritance Types of Inheritance in Java The extends Keyword Why Use Inheritance? The super Keyword Accessing Parent Class Members Invoking Parent Class Constructor Method Overriding in Inheritance Inheritance...

Constructors and the this Keyword in Java

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Table of Contents Introduction What is a Constructor? Types of Constructors Default Constructor Parameterized Constructor Constructor Overloading Purpose of Constructors The this Keyword Referring to Instance Variables Calling Constructors Passing Current Object Returning Current Object Constructor vs...

Classes and Objects in Java

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Table of Contents Introduction to Classes and Objects Defining a Class Fields (Instance Variables) Methods in a Class Creating Objects Memory Allocation for Objects Accessing Members using Objects Multiple Objects of the...

Object-Oriented Programming – Basics and Concepts

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Table of Contents Introduction to Object-Oriented Programming (OOP) Core Principles of OOP Classes and Objects Constructors The this Keyword Encapsulation Inheritance Polymorphism Abstraction Summary and Best Practices 1. Introduction to Object-Oriented Programming (OOP) Object-Oriented Programming (OOP)...

Methods, Overloading, and Recursion in Java

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Table of Contents Introduction to Methods in Java Declaring and Calling Methods Method Parameters and Return Types Method Overloading Recursion in Java Advantages and Use Cases of Recursion Stack Memory and...

Strings in Java – String Class, Immutable Nature, StringBuilder and StringBuffer

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Table of Contents Introduction to Strings in Java The String Class String Declaration and Initialization String Immutability Common String Methods String Comparison String Concatenation and Performance StringBuilder vs StringBuffer Real-world Use Cases Summary and...

Arrays in Java – Single & Multi-dimensional Arrays, Array Operations

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Table of Contents What Are Arrays? Advantages of Using Arrays Declaring and Initializing Arrays Accessing and Modifying Elements Iterating Through Arrays Multi-dimensional Arrays Common Array Operations Arrays vs ArrayList Real-world Examples Summary and What’s...

Loops in Java – for, while, do-while, break and continue

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Table of Contents Introduction to Loops The for Loop The while Loop The do-while Loop Loop Control Statements: break and continue Infinite Loops Nested Loops Real-World Examples Summary and What’s Next 1. Introduction to...
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