mysql - 一天中每小时的行时间戳

Question

我有一张如下表：

tmstp in	tmstp out	result
2021-01-30 14:10:00	2021-01-30 15:50:00	01:40:00
2021-01-30 15:55:00	2021-01-30 16:05:00	00:10:00
2021-01-30 19:00:00	2021-01-30 22:10:00	03:10:00

但我想知道在这样的表中：

tmstp in	tmstp out	result
2021-01-30 14:10:00	2021-01-30 14:59:59	00:49:59
2021-01-30 15:00:00	2021-01-30 15:50:00	00:50:00
2021-01-30 15:55:00	2021-01-30 15:59:59	00:04:59
2021-01-30 16:00:00	2021-01-30 16:05:00	00:05:00
2021-01-30 19:00:00	2021-01-30 19:59:59	00:59:59
2021-01-30 20:00:00	2021-01-30 20:59:59	00:59:59
2021-01-30 21:00:00	2021-01-30 21:59:59	00:59:59
2021-01-30 22:00:00	2021-01-30 22:10:00	00:10:00

这将是每一行在一小时内的扩展输出。行的间隔必须在一小时内

感谢您的帮助

Answer 1

我建议将时间调整为整点，而不是整点前一秒。

通过此更改，您可以使用递归 CTE：

with recursive cte as (
      select ts_in, date(ts_in) + interval hour(ts_in) + 1 hour as ts_hour_end, ts_out
      from t
      union all
      select ts_hour_end, date(ts_hour_end) + interval hour(ts_hour_end) + 1 hour, ts_out
      from cte
      where ts_hour_end < ts_out
     )
select ts_in, least(ts_hour_end, ts_out), timediff(least(ts_hour_end, ts_out), ts_in) as diff
from cte;

Here 是一个 dbfiddle。