Query a 30 day interval for every 30 day interval in the last year - sql

Question

I want to query every 30 day interval in 2021, but I don't know how to do it without a for loop in SQL.
Here's psuedo code of what I want to do with a table called _table and a date column called application_date:
for _day in range(335):
select '2021-01-01' + _day as start_date, count(*) as _count
from _table
where '2021-01-01' + _day <= application_date <= ('2021-01-01' + _day + interval '30' day )
It would output something like this:
start_date
_count
2021-01-01
{number of rows between 2021-01-01 and 2021-01-31}
2021-01-02
{number of rows between 2021-01-02 and 2021-02-01}
...
...
2021-11-31
{number of rows between 2021-11-31 and 2021-12-30}
2021-12-01
{number of rows between 2021-12-01 and 2021-12-31}

Answer 1

Assuming that you have rows for each day you can group data by date, count it in the group and then use sum window function with range of 30 rows (current + next 30 rows, note that {rows between 2021-01-01 and 2021-01-31} have interval of 31 day, not 30):
-- sample data
WITH dataset(start_date) AS (
VALUES (date '2021-01-01'),
(date '2021-01-01'),
(date '2021-01-01'),
(date '2021-01-02'),
(date '2021-01-03'),
(date '2021-01-03')
)
-- query
select start_date
, sum(cnt) over (order by start_date ROWS BETWEEN CURRENT ROW AND 30 FOLLOWING) rolling_count_31_days
from (
select start_date
, count(*) cnt
from dataset
where year(start_date) = 2021
group by start_date
)
Output:
start_date
rolling_count_31_days
2021-01-01
6
2021-01-02
3
2021-01-03
2
If some dates are missing - checkout this or this answer describing how to insert missing dates and insert dates into the group result with cnt set to 0.
Note that Trino (the new name for PrestoSQL) updated support for RANGE frame type and you can implement this without need to insert missing rows.