Love at first query - Speaker Deck

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DouEnergy

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SQLite for analytics

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We all love Postgres

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S3, malloc for the Internet

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Building and operating a pretty big storage system called S3

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We all love AWS S3

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How many of you can set up a Postgres on your laptop to analyze a CSV(JSON, Parquet) on AWS S3?

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And...

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In less 3 minutes

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DuckDB-wasm

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just 3 seconds

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SELECT * FROM 'https://r2duck2.douenergy.com/central-park-w eather.csv';

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Demo 1

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CREATE TABLE R2Weather AS FROM 'https://r2duck2.douenergy.com/central-park- weather.csv';

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Annual average of maximum temperature ? (每一年的單日最高溫平均)

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SELECT EXTRACT(YEAR FROM DATE) AS year, AVG(TMAX) as average_max_temp FROM R2weather GROUP BY year ORDER BY year;

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Rolling average of the maximum temperature over the last 7 days for each date?(過去七日的最高溫平均)

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SELECT DATE, TMAX, AVG(TMAX) OVER sevenday AS rolling_7_day_avg FROM R2weather WINDOW sevenday AS(ORDER BY DATE ROWS BETWEEN 6 PRECEDING AND CURRENT ROW) LIMIT 20;

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Average maximum temperature？ precipitation(降雨量) 0.1 < precipitation < 0.2 0.4 < precipitation

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SELECT COUNT(*) FILTER (WHERE PRCP BETWEEN 0.1 AND 0.2) low_days, AVG(TMAX) FILTER (WHERE PRCP BETWEEN 0.1 AND 0.2) low_prcp_temp, COUNT(*) FILTER (WHERE 0.4 < PRCP) high_days, AVG(TMAX) FILTER (WHERE 0.4 < PRCP) high_prcp_temp FROM R2Weather;

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Apache Arrow

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Benchmark

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Demo 2

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葛來分多加10分

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葛來分多再加10分

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Two month ago 🔥

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Duck Arts Defence 🦆🪄

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Duck Arts Defence 🦆🪄

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You may say I'm a SQLer But I'm not the only one. I hope someday you'll join us.

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Thanks