beginner-data-science

A Python data analysis project that explores patterns and trends in event-based datasets through cleaning, exploratory analysis, and visualization to extract meaningful insights.

SQL project merging tables with INNER JOIN and UNION — customer-product matching and multi-table product catalog consolidation

SQL data analysis project on retail sales performance, promotion ROI, and customer trends — portfolio project with real business queries.

Python script automating monthly vehicle expense calculation under an odd-even license plate traffic policy, using loops and conditionals.

Python OOP project modeling employee expenses at a company — inheritance, method overriding, and polymorphism across full-time and freelance roles.

Pandas data transformation pipeline in Python — type conversion, ID formatting, date parsing, missing value handling, and hierarchical indexing.

SQL sales analysis using GROUP BY and CASE statements to segment transactions into High/Medium/Low revenue categories.