我有一个包含这些值的表；
user_id ts val
uid1 19.05.2019 01:49:50 0
uid1 19.05.2019 01:50:15 0
uid1 19.05.2019 01:50:20 0
uid1 19.05.2019 01:59:50 1
uid1 19.05.2019 02:20:10 1
uid1 19.05.2019 02:20:15 0
uid1 19.05.2019 02:20:19 0
uid1 19.05.2019 02:30:53 1
uid1 19.05.2019 11:10:25 1
uid1 19.05.2019 11:13:40 0
uid1 19.05.2019 11:13:50 0
uid1 19.05.2019 11:20:19 1
uid2 19.05.2019 15:01:44 0
uid2 19.05.2019 15:05:55 0
uid2 19.05.2019 17:19:35 1
uid2 19.05.2019 17:20:01 0
uid2 19.05.2019 17:20:35 0
uid2 19.05.2019 19:15:50 1
当我只用 partition by 子句查询这个表时，结果看起来像这样； …