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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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Basic Authentication Setup in Spring Security

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Table of Contents What is Basic Authentication? How Basic Authentication Works in Spring Security Setting Up Basic Authentication in a Spring Boot Application Creating Custom User Details Configuring a...

Introduction to Spring Security

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Table of Contents What is Spring Security? Core Features of Spring Security How Spring Security Works Spring Security Architecture Adding Spring Security to a Spring Boot Application Default Behavior and...

API Documentation with Swagger/OpenAPI

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Table of Contents Introduction to API Documentation What is Swagger and OpenAPI? Setting Up Swagger in Spring Boot Annotating Your API with Swagger Annotations Configuring Swagger UI Customizing Swagger Documentation Using...

DTO Pattern and ModelMapper in Java

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Table of Contents Introduction to DTO Pattern Benefits of Using DTO Introduction to ModelMapper Using ModelMapper to Convert Entities to DTOs Example: Using DTOs and ModelMapper in Spring Boot Conclusion 1....

JPQL, Native Queries, Pagination & Sorting in Spring Data JPA

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Table of Contents Introduction to JPQL (Java Persistence Query Language) Native Queries in Spring Data JPA Pagination and Sorting Conclusion 1. Introduction to JPQL (Java Persistence Query Language) JPQL (Java...

Defining Entities and Relationships in Java with JPA

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Table of Contents Introduction to Entities and Relationships Defining Entities in JPA Defining Relationships in JPA One-to-One Relationship One-to-Many Relationship Many-to-One Relationship Many-to-Many Relationship Cascading Operations in Relationships Fetching Strategies: Eager vs Lazy...

JPA Repositories & CRUD Operations

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Table of Contents Introduction to JPA Repositories CRUD Operations in Spring Data JPA Working with Repository Interfaces Customizing CRUD Operations Paging and Sorting with JPA Repositories Conclusion 1. Introduction to JPA...

Introduction to Spring Data JPA

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Table of Contents Introduction to Spring Data JPA Benefits of Using Spring Data JPA Setting Up Spring Data JPA in a Spring Boot Application Understanding JPA and Hibernate Common...

Global Exception Handling with @ControllerAdvice

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Table of Contents Introduction Overview of Exception Handling in Spring Using @ControllerAdvice for Global Exception Handling Implementing Global Exception Handler Handling Specific Exceptions Customizing Response for Exceptions Conclusion 1. Introduction In real-world applications,...

Input Validation with Bean Validation (@Valid)

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Table of Contents Introduction Bean Validation Overview Using @Valid for Input Validation Custom Validation Annotations Handling Validation Errors Conclusion 1. Introduction In any application, validating user input is a critical task to...

ResponseEntity & Custom Response Handling in Spring Boot

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Table of Contents Introduction ResponseEntity Overview Creating Custom Response Objects Handling Success and Error Responses Using ResponseEntity for Different HTTP Status Codes Conclusion 1. Introduction In Spring Boot, when building RESTful APIs,...

Path Variables, Query Parameters, and RequestBody in Spring Boot

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Table of Contents Introduction Path Variables in Spring Boot Query Parameters in Spring Boot RequestBody in Spring Boot Combining Path Variables, Query Parameters, and RequestBody Conclusion 1. Introduction In RESTful web services,...
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