📚 Database Systems Feb2026 – Course Repository

Welcome to the official repository for the Databases After Graduation course.

This repository contains all course materials, backend examples, SQL scripts, assignments, and installation guides required throughout the course.

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🎯 Course Overview

This course focuses on practical, production-level database skills used in real backend systems.

Topics include:

• Relational data modeling
• Advanced SQL querying
• Indexing & performance optimization
• Execution plans
• Connecting databases to backend APIs
• ORM vs Raw SQL trade-offs
• Connection pooling
• Backend best practices

By the end of this course, you will understand not only how to write SQL queries, but how databases behave inside real-world backend architectures.

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📂 Repository Structure

Class_1_Data_Modeling_for_Real_World_Systems/
│── Concepts/
│   │── Entities_Relationships_Schema_Design
│   │── Query_Driven_Data_Modeling
│   │── Normalization_vs_Denormalization
│   │── Read_vs_Write_Heavy_Schema_Design
│── Tools/
│   │── MySQL

Class_2_Production_SQL_and_Query_Execution/
│── Concepts/
│   │── Production_Level_SQL
│   │── Query_Execution_Behavior
│   │── Execution_Plans_EXPLAIN
│   │── Indexing_Strategies
│   │── Read_vs_Write_Performance_Tradeoffs
│── Tools/
│   │── MySQL
│   │── SQL_Execution_Plan_Analysis

Class_3_Databases_Behind_APIs/
│── Concepts/
│   │── Backend_Database_Architecture
│   │── API_Request_Lifecycle
│   │── Database_Access_Patterns
│   │── Connection_Pooling
│   │── Pagination_Offset_and_Cursor
│   │── ORM_vs_Raw_SQL_Tradeoffs
│── Tools/
│   │── Python_FastAPI
│   │── ORM
│   │── Postman
│   │── Swagger_OpenAPI

Class_4_Concurrency_Consistency_and_Reliability/
│── Concepts/
│   │── Transactions
│   │── Commit_and_Rollback
│   │── Race_Conditions
│   │── Concurrent_Request_Handling
│   │── Transaction_Isolation_Levels
│   │── Read_Replicas_and_Consistency_Tradeoffs

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⚙️ Installation Requirements

Before starting, make sure you have:

Required Tools

• MySQL
• Python 3.10+
• Postman
• VS Code (recommended)

Required Python Libraries

pip install fastapi
pip install uvicorn
pip install sqlalchemy
pip install pymysql
pip install cryptography
pip install pydantic python-dotenv

🧠 Learning Philosophy

This course emphasizes:

• Understanding how databases behave in backend systems
• Writing efficient, scalable SQL
• Designing clean relational schemas
• Thinking in terms of data architecture, not just tables
• The goal is to bridge the gap between academic SQL knowledge and production-level backend development.