查找给定年份和月份之间的日期范围

Question

我有下表的日期范围：

create table stf
(
    d1 date,
    d2 date
);

insert into stf values
('2020-01-01','2020-12-31'),
('2020-11-25','2020-11-25'),
('2019-01-01','2020-11-29'),
('2020-11-01','2021-01-06'),
('2019-01-23','2021-06-06'),
('2019-01-20','2019-12-30');

我正在寻找当前日期的月份和年份之间的日期范围。

预期结果应该是：对于当前日期

d1      d2
--------------------------
2020-01-01  2020-12-31
2019-01-01  2020-11-29
2020-11-01  2021-01-06
2019-01-23  2021-06-06
2020-11-25  2020-11-25

注意：2020-11 将介于上述范围之间。

试一试：

select * 
from stf
where to_char(now(),'YYYY-MM') between to_char(d1,'YYYY-MM') and to_char(d2,'YYYY-MM');

输出：

d1      d2
--------------------------
2020-01-01  2020-12-31
2020-11-25  2020-11-25
2019-01-01  2020-11-29
2020-11-01  2021-01-06
2019-01-23  2021-06-06

试试 2：

select * 
from stf
where ((date_part('month',now()) between date_part('month',d1) and date_part('month',d2))or date_part('year',now()) between date_part('year',d1) and date_part('year',d2))

输出：

d1      d2
--------------------------
2020-01-01  2020-12-31
2020-11-25  2020-11-25
2019-01-01  2020-11-29
2020-11-01  2021-01-06
2019-01-23  2021-06-06

Answer 1

您可以只检查当前月份的开始是否属于该范围：

select *
from stf
where date_trunc('month', current_date) between d1 and d2