如何解决MySQL查询以根据日期查找最长的值序列
我想根据日期列找到给定值的最长序列,例如给定表格:
+-------+-------------------+
|value |timestamp |
+-------+-------------------+
|1 |2021-02-20 13:31:21|
|0 |2021-02-20 13:31:58|
|1 |2021-02-20 13:32:00|
|1 |2021-02-20 13:33:24|
|1 |2021-02-20 13:34:12|
|0 |2021-02-20 13:36:51|
对于值“1”,最长的序列是 2 分 12 秒长,如何做到这一点?
希望有人能帮忙!谢谢!
解决方法
您可以通过累计计算 0
值的数量来分配一个组。然后只需聚合即可查看所有组:
select min(timestamp),max(timestamp)
from (select t.*,sum(value = 0) over (order by timestamp) as grp
from t
) t
where value = 1
group by grp;
计算差值并取最长周期:
select min(timestamp),max(timestamp),second_to_time(to_seconds(max(timestamp)) - to_seconds(min(timetamp)))
from (select t.*,sum(value = 0) over (order by timestamp) as grp
from t
) t
where value = 1
group by grp
order by to_seconds(max(timestamp)) - to_seconds(min(timetamp)) desc
limit 1;
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