Practical SQL and data analytics

Working notes on fraud detection, public-sector data, and analytics engineering — from inside a program-integrity team. Mostly SQL, with the usual cloud data warehouses and BI tools. Occasionally Python. Always grounded in the actual queries I run.

Recent writing

• Six SQL patterns I use to catch transaction fraud May 12, 2026

  The actual queries I run when I'm hunting fraud in transaction data. Velocity, impossible distances, suspicious amounts, merchant clusters, off-hours buys, and window functions.