我可以在同一查询中使用 BETWEEN 和 IN 子句指定多个间隔吗？

Question

我正在查询一些时间序列数据，并希望将查询应用于多个指定的时间间隔，以便为每个间隔获取不同的行。

我的意思是：这些是时间间隔（不要看空的，要使用 coalesce()）：

并想像这样查询我的数据：

select count(*) from time_series where time between [multiple_intervals_here]

我最接近的解决方案是：

select count(*) from time_series where time (between x and y) or (between a and b)

但显然，我无法动态指定间隔并且不会为每个间隔获取一行。

（我将对其应用更多聚合函数，而不仅仅是count()）

最终结果如下所示：

提前致谢

Answer 1

对每个区间进行单独查询并合并结果

select 'interval 1' as interval, count(*) from time_series where time between A and B
union
select 'interval 2' as interval, count(*) from time_series where time between C and D
union
select 'interval 3' as interval, count(*) from time_series where time between E and F

Answer 2

t CTE 是间隔列表的模仿。

with t (id, time_start, time_stop) as
(
 values
 ('interval-A', '2022-05-26T10:00'::timestamp, '2022-05-26T12:00'::timestamp),
 ('interval-B', '2022-05-26T13:00', '2022-05-26T17:00')
)
select t.id, count(l.x) as "count", avg(l.x) as "avg" 
from t
cross join lateral 
(
 select x from the_table tt 
 where tt.start_time between t.time_start and t.time_stop
   and tt.end_time   between t.time_start and t.time_stop
) l
group by t.id;

我可以在同一查询中使用 BETWEEN 和 IN 子句指定多个间隔吗？

Can i specify multiple intervals using BETWEEN and IN clause in the same query?

sql

postgresql

timescaledb