Welcome to my SQL Portfolio – a collection of projects that showcase my ability to solve real-world problems with data. This repository brings together work across different topics, industries, and SQL techniques, all with the goal of transforming raw data into insights and efficiency.
My projects span a variety of domains:
Fraud Detection → Flagging unusual transaction patterns and building rule-based checks.
HR & Payroll Systems → Automating payroll reports and employee records with relational models.
Operational Efficiency → Creating queries and structures to reduce redundancy and improve performance.
Industry-Specific Cases → From finance to retail to workforce management.
Each project includes SQL scripts (PostgreSQL / SQLite) and documentation explaining the logic, design, and decisions.
Schema Design & Data Modeling
Building normalized tables and relationships
Enforcing data integrity with keys & constraints
Querying Techniques
CTEs, subqueries, and window functions
Aggregations and analytical queries
Optimization & Organization
Partitioning for large datasets
Efficient joins and indexing strategies
Data Loading & Transformation
Using COPY, CSV imports, and cleaning raw data
PostgreSQL – Primary database for advanced queries and schema design
SQLite – Lightweight projects, quick prototypes, and portability
CSV & flat file data sources
Queries / DML scripts – Solving business problems
Notes / Documentation – Explaining the approach and insights