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我在嘗試對時間戳之間的差異小於60秒的連續行(按時間戳排序)進行分組時遇到問題。如何根據計算對行進行分組?
下面是一個示例表:
user video timestamp time_diff
---- -------- ----------------------- ---------
Bob balldrop 2017-06-01 06:00:00 UTC null
Bob balldrop 2017-06-01 06:00:10 UTC -10
Bob balldrop 2017-06-01 06:00:30 UTC -20
Bob balldrop 2017-06-01 06:00:45 UTC -15
Bob balldrop 2017-06-01 06:04:00 UTC -195
Bob balldrop 2017-06-01 06:04:30 UTC -30
Bob bounce 2017-06-01 06:05:00 UTC null
Bob bounce 2017-06-01 06:05:20 UTC -20
期望的結果:
user video timestamp group
---- -------- ----------------------- ---------
Bob balldrop 2017-06-01 06:00:00 UTC 1
Bob balldrop 2017-06-01 06:00:10 UTC 1
Bob balldrop 2017-06-01 06:00:30 UTC 1
Bob balldrop 2017-06-01 06:00:45 UTC 1
Bob balldrop 2017-06-01 06:04:00 UTC 2
Bob balldrop 2017-06-01 06:04:30 UTC 2
Bob bounce 2017-06-01 06:05:00 UTC 3
Bob bounce 2017-06-01 06:05:20 UTC 3
我希望你能回答!我簡直不敢相信這很簡單。我仍然試圖理解具有'diff' <60的行如何獲得與分區中的起始行相同的'group_number'。看起來像魔術!一如既往地感謝!從你那裏學習很多。 – dnaeye