Over a two-month period, contributed four new features to the Hyubbbb/FLY_PCSQL repository, focusing on SQL-driven data extraction and management. Developed hierarchical data exploration for ECOLI_DATA using complex self-joins to establish parent-child relationships and extract multi-level identifiers, and implemented a query to identify top-favorite restaurants by food type using subqueries and aggregation. Enhanced animal intake data retrieval with null-safe handling and improved display logic, and created a categorized economy books catalog with formatted publication dates. All work emphasized robust SQL scripting, database management, and data quality improvements, supporting analytics workflows and ensuring reliable, reusable artifacts for downstream business use.