You're a security operations center (SOC) analyst at 3 AM. Your phone buzzes — the machine learning-based intrusion detection system just fired an alert. You rub your eyes and pull up the dashboard.
You've been there. You have a massive table in BigQuery — millions of rows, terabytes of data — and you want to train a simple logistic regression.
Master SQL window functions for data science: running totals, RANK, LAG, NTILE, and the common pitfalls that trip up candidates in technical interviews.
Learn the four most common SQL join mistakes that silently duplicate your rows, how to spot them with a 30-second diagnostic, and the right fix for each one.