📊 Data Warehouse and Analytics Project

Welcome to the Data Warehouse and Analytics Project repository! 🚀
This portfolio project showcases a complete end-to-end data warehousing and analytics solution—from raw data ingestion to business intelligence reporting. It follows industry best practices in data engineering and analytics.

🏗️ Data Architecture

This project follows the Medallion Architecture, structured into three layers:

• Bronze Layer: Stores raw data ingested as-is from source systems (CSV files) into a SQL Server database.
• Silver Layer: Processes and transforms data with cleansing, standardization, and normalization techniques.
• Gold Layer: Contains business-ready, analytics-optimized data modeled using a star schema.

📖 Project Overview

This project involves:

• Data Architecture: Building a modern warehouse with Medallion Architecture (Bronze, Silver, Gold).
• ETL Pipelines: Extracting, transforming, and loading data from ERP and CRM CSVs.
• Data Modeling: Designing fact and dimension tables for optimized analytical queries.
• Analytics & Reporting: Creating SQL-based reports and dashboards for actionable business insights.

🧰 Tools & Resources

Everything is 100% free and open-source!

• 📂 Datasets: ERP and CRM CSV files
• 🧩 SQL Server Express: Lightweight SQL Server instance
• 🖥️ SQL Server Management Studio (SSMS): GUI for SQL Server
• 🧠 Draw.io: For data modeling and architecture diagrams
• 💡 Notion: Project templates and documentation
• 💻 GitHub: For version control and collaboration

🚀 Project Requirements

🧱 Part 1: Building the Data Warehouse (Engineering)

Goal: Develop a modern data warehouse using SQL Server for unified, analytics-ready sales data.

Specifications:

• Import data from two sources (ERP and CRM, in CSV format).
• Cleanse and resolve data quality issues.
• Integrate data into a single analytical model.
• Focus on the most recent data (no historization required).
• Document the data model for stakeholders and analysts.

📊 Part 2: Business Intelligence & Reporting (Analysis)

Goal: Use SQL to analyze data and generate business insights.

Insights Provided:

• Customer Behavior
• Product Performance
• Sales Trends

These insights help drive data-driven decision-making.

📄 For full details, see docs/requirements.md

📂 Repository Structure

data-warehouse-project/
│
├── datasets/                      # Raw datasets used for the project (ERP and CRM data)
│
├── docs/                          # Project documentation and architecture details
│   ├── etl.drawio                 # Draw.io file showing ETL techniques and flow
│   ├── data_architecture.drawio   # Diagram of the overall data warehouse architecture
│   ├── data_catalog.md            # Metadata and field descriptions of datasets
│   ├── data_flow.drawio           # Visual data flow from source to destination
│   ├── data_models.drawio         # Star schema and data model designs
│   ├── naming-conventions.md      # Standards for naming tables, fields, and files
│
├── scripts/                       # SQL scripts for ETL and transformation
│   ├── bronze/                    # Scripts for loading raw data (Bronze layer)
│   ├── silver/                    # Scripts for data cleansing and transformation (Silver layer)
│   ├── gold/                      # Scripts for building the analytical model (Gold layer)
│
├── tests/                         # Data quality checks and testing scripts
│
├── README.md                      # Project overview and setup instructions
├── LICENSE                        # License file for this repository
├── .gitignore                     # Git ignore rules for files and folders
└── requirements.txt               # Required software/tools and setup dependencies