Transforming cumulative sums into monthly values
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Senior Data Engineer • Contractor / Freelancer • GCP & AWS Certified
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BigQuery Window Functions
Part 11 of 13
A focused guide to window functions in BigQuery — cumulative sums, rolling averages, ranking functions, named windows, RANGE frames, and more.
Beware of ROW_NUMBER without ORDER BY
Haven’t posted all summer, but this bug pulled me straight out of the shadows. I recently faced a mystery that pushed me to the edge of despair. It seemed like a simple issue at first glance. A report kept changing completely at random. I spent a goo...
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