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BigQueryで1行ずつの累積を求めるメモ

Posted at

やりたいこと

日付と時間のデータを使って、1行ずつ累積して合計時間を算出したい。
毎回忘れるのでメモ
スクリーンショット 2020-01-15 16.35.07.png

SQL

SELECT
  date,
  minutes,
  SUM(minutes) OVER(ORDER BY date) AS total_minutes
FROM mytable

ORDER BY dateでdateの順番に上から足してくれる
PARTITION BYしていないので、全部の行を順番に累積

結果

スクリーンショット 2020-01-15 16.35.16.png

おまけ

ORDER BYを指定しないと全ての行の和を計算する

SELECT
  date,
  minutes,
  SUM(minutes) OVER() AS total_minutes
FROM mytable
スクリーンショット 2020-01-15 16.42.51.png
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