SQL patterns I use to catch transaction fraud

A practical guide to SQL patterns for catching transaction fraud earned 157 points, rewarding the kind of low-level, high-impact engineering the community respects. It is 30% lighter than the runner-up in coding detail but delivers 98% accuracy in fraud detection, based on 500,000 simulated transactions. This guide is cheaper than the typical rival paid course, offering free SQL snippets that saved users an average of $200 each.