考虑以下方法
create temp function set_day(date date, day int64) as (
ifnull(
safe.date(extract(year from date), extract(month from date), day),
last_day(date)
)
);
select Date,
set_day(Starting_Date, 29) as Starting_Date,
set_day(Ending_Date, 28) as Ending_Date
from (
select *, if(extract(day from Date) < 29,
struct(date_sub(Date, interval 1 month) as Starting_Date, Date as Ending_Date),
struct(Date as Starting_Date, date_add(Date, interval 1 month) as Ending_Date)
).*
from your_table
)
如果应用于您的问题中的示例数据
with your_table as (
select date '2020-03-13' Date union all
select '2021-03-13' union all
select '2020-06-30' union all
select '2021-01-01' union all
select '2021-11-11'
)
输出是
你可以用下面的方法测试整个东西
create temp function set_day(date date, day int64) as (
ifnull(
safe.date(extract(year from date), extract(month from date), day),
last_day(date)
)
);
with your_table as (
select date '2020-03-13' Date union all
select '2021-03-13' union all
select '2020-06-30' union all
select '2021-01-01' union all
select '2021-11-11'
)
select Date,
set_day(Starting_Date, 29) as Starting_Date,
set_day(Ending_Date, 28) as Ending_Date
from (
select *, if(extract(day from Date) < 29,
struct(date_sub(Date, interval 1 month) as Starting_Date, Date as Ending_Date),
struct(Date as Starting_Date, date_add(Date, interval 1 month) as Ending_Date)
).*
from your_table
)