[英]Postgres most efficient way to split overlapping daterange
For example I have following entities in table A:例如,我在表 A 中有以下实体:
entityId, metaData, startDate, endDate
Row 1: 1, some content, 2021-01-01, 2022-01-01
Row 2: 1, some content 2, 2022-01-02, 9999-12-31
And I have following entities in table B:我在表 B 中有以下实体:
entityId, metaData, startDate, endDate
Row 1: 1, overlapping content, 2021-08-12, 2022-01-01
Row 2: 1, overlapping content 2, 2022-03-01, 2023-01-01
Row 3: 1, overlapping content 3, 2023-01-02, 9999-12-31
|-----------ROW 1 (A)-----------| |-----------ROW 2 (A)------------|
|-------ROW 1 (B)-------| |--ROW 2 (B)--| |--ROW 3 (B)--|
As output I want to split rows from A by overlapping with rows from B (using entityId key):作为输出,我想通过与 B 中的行重叠来分割 A 中的行(使用 entityId 键):
Row 1 (A): 1, some content, 2021-01-01, 2021-08-11
Row 1 (B): 1, overlapping content, 2021-08-12, 2021-12-31
Row 2 (A): 1, some content 2, 2022-01-02, 2022-02-28
Row 2 (B): 1, overlapping content 2, 2022-03-01, 2023-01-01
Row 3 (B): 1, overlapping content 3, 2023-01-02, 9999-12-31
Does smth like this fit your needs?像这样的东西是否符合您的需求?
with cte as
(
select * from table_a
union all
select * from table_b
)
select
entityid,
metadata,
startdate,
coalesce(
((lead(startdate) over (order by startdate)) - INTERVAL '1 DAY') :: DATE,
enddate
)
from cte order by startdate
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