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Introduction The structure of this tutorial assumes an intermediate level knowledge of Python but not much else. No knowledge of concurrency is expected. The goal is to give you the tools you need to get going with gevent, help you tame your existing concurrency problems and start writing asynchronous applications today. Contributors In chronological order of contribution: Stephen Diehl Jérémy Bet
/* Based on device data, this query returns the average * of the battery level for every hour for each device_id */ WITH avg_metrics AS ( SELECT device_id, DATE_BIN('1 hour'::INTERVAL, time, 0) AS period, AVG(battery_level) AS avg_battery_level FROM devices.readings GROUP BY 1, 2 ORDER BY 1, 2 ) SELECT period, t.device_id, manufacturer, avg_battery_level FROM avg_metrics t, devices.info i WHERE t.
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