Oracle SQL Learning Portfolio

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📑 Table of Contents

• Overview
• Project Structure
• Learning Modules
• Business Scenarios Highlights
  • HR + Finance + IT
  • Sales Department (NEW)
• Getting Started
• Example Output
• Future Enhancements
• Contributions
• License
• About

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🚀 Overview

This project is a hands-on Oracle SQL learning portfolio, progressing from fundamentals to professional-level reporting using real-world business scenarios.

It uses Oracle Linux 23 AI Free and Oracle SQL Developer for all examples, with dummy data across departments like HR, Finance, IT, and now Sales.

✅ This repo is designed to showcase my query-building, reporting, and business analysis skills using SQL.

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🗂️ Project Structure

oracle-sql-portfolio/
├── queries/
│ └── real_world/
│ └── business_scenarios.sql # Main SQL scenario bundle
├── docs/
│ └── business_scenarios_summary.md # Detailed learning notes and explanations
├── dummy_data/
│ ├── hr_finance_it_data.sql # Core departments
│ └── sales_data.sql # NEW: Sales department data
├── README.md # You're here!
└── LICENSE

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📚 Learning Modules

Module	Title	Description
01	SQL Foundation	SELECT, WHERE, ORDER BY, basic filtering and expressions
02	Joins & Set Operations	INNER, LEFT, RIGHT, FULL, UNION, INTERSECT
03	Aggregation & Grouping	GROUP BY, HAVING, COUNT, SUM, AVG
04	Subqueries & CTEs	Nested queries, WITH clause, modular SQL
05	Analytical Functions	RANK, DENSE_RANK, LEAD/LAG, PARTITION BY
06	HR + Finance + IT Scenarios	Payroll variance, training impact, budget tracking
07	Real-World Sales Analytics 💼	Sales revenue vs budget, commissions, inventory correlation (NEW!)
08	Dashboard Queries & Reports 📊	KPI summaries, cross-department reports (Coming Soon)

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🔎 Business Scenarios Highlights

Explore realistic use cases powered by SQL:

HR + Finance + IT

• Payroll vs Budget Variance
• Inventory Cost Allocation
• Training Completion Rates by Department
• Budget Forecasting
• System Downtime Impact on Payroll
• Training ROI on Compensation

Sales Department (NEW)

• 💰 Sales Revenue vs Budget Performance
• 💼 Commission Impact on Payroll
• 📦 Sales and Inventory Correlation

📖 Read all scenario summaries and explanations in
docs/business_scenarios_summary.md

🧠 Run the SQL directly from
queries/real_world/business_scenarios.sql

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🧪 Getting Started

1. Clone the Repo

git clone https://github.com/crispusomollo/oracle-sql-portfolio.git
cd oracle-sql-portfolio

2. Set up your Oracle DB Environment

• Use Oracle Linux 23 AI Free

• Install Oracle SQL Developer

• Create a user/schema for your learning environment

3. Load Dummy Data

-- Load core data
@dummy_data/hr_finance_it_data.sql-- Load sales data (NEW)
@dummy_data/sales_data.sql

4. Start Exploring Queries

Open queries/real_world/business_scenarios.sql in SQL Developer and start executing!

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📌 Future Enhancements

• Generate ER diagram and include in docs

• Create demo GIF/video

• Integrate SQL linting and formatting

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🤝 Contributions

Contributions are welcome! Feel free to:

• Fork this repo and customize for your own learning

• Submit PRs for additional use cases

• Open issues with questions or feedback

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📜 License

This project is licensed under the MIT License.

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🙋‍♂️ About

Maintained by Crispus Omollo

Proudly built with real SQL and even realer scenarios.