Intersecting GPS Tracks to Identify Infected Individuals — I’m not a huge fan of COVID-19 related content, but this is a pretty interesting technique with numerous use cases. Essentially it uses PostGIS to identify overlapping paths.
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How to Count Hits on a Web Site in Postgres — If you want to be...How to Count Hits on a Web Site in Postgres — If you want to be accurate, it’s all matter of handling concurrency. A rather elaborate solution is on offer here.