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select setseed(1); create table vals as select dates, date_trunc('day', dates) as days, extract(isodow from dates) as dow, round(random()*5) as num from generate_series(timestamp '2022-07-28', '2022-08-09', '6 hours') s(dates); select * from vals order by dates; select distinct days, case when dow in (6, 7) then 0 when dow = 1 then sum(num) over(order by days range between '2 days' preceding and '0 days' following) else sum(num) over(partition by days) end as sum_num from vals order by days

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