Analyzed marketing campaign performance using SQL queries. Calculated key KPIs (CTR, ROI, CAC) for business evaluation. Built analytical SQL views for exploratory analysis. Designed interactive dashboards in Power BI to visualize insights. Analyzed sales performance using real-world datasets. Developed business-oriented SQL queries and KPI dashboards. Delivered interactive Power BI reports focused on decision-making. Built a system for VAT, subtotal, and tax analysis. Automated calculations and created a professional Power BI dashboard. Migrated data from CSV files to PostgreSQL. Created tables and calculated KPIs using SQL, with final visualization in Power BI. Analyzed sales metrics: monthly sales, average ticket, top products, and annual totals.