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我在尝试对时间戳之间的差异小于60秒的连续行(按时间戳排序)进行分组时遇到问题。如何根据计算对行进行分组?
下面是一个示例表:
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
期望的结果:
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!我简直不敢相信这很简单。我仍然试图理解具有'diff' <60的行如何获得与分区中的起始行相同的'group_number'。看起来像魔术!一如既往地感谢!从你那里学习很多。 – dnaeye