Calculate SUM between two dates SQL SERVER - sql

Question

I'm having two tables
Calendar
FirstDate | LastDate
------------+-----------
2020-05-01 2020-05-03
2020-05-02 2020-05-04
ProfileRate
ID | Date | Rate | Product
---+------------+------+----------
1 2020-05-01 100 Prod1
2 2020-05-02 200 Prod1
3 2020-05-03 300 Prod1
4 2020-05-04 400 Prod1
5 2020-05-01 150 Prod2
6 2020-05-02 250 Prod2
7 2020-05-03 350 Prod2
8 2020-05-04 450 Prod2
I want to calculate SUM. Something like this
FirstDate | LastDate | Prod1 | Prod2
------------+-------------+--------+-------
2020-05-01 2020-05-03 600 750
2020-05-02 2020-05-04 900 1050
What I've tried:
SELECT [Date], SUM([Rate])
FROM [ProfileRate]
WHERE [Date] BETWEEN '2020-05-01' AND '2020-05-04'
GROUP BY [Date]
Please help me. Thanks

Answer 1

you have to do several steps to solve the problem:
combine calendar records with profiles
establish which profiles meet the calendar range
total the value for each profile and date range
finally establish the detailed information of the calendar
this query meets the conditions
with DataForCalendar as
(
SELECT IdCalendar,FirstDate,LastDate,Id,DateRate,Rate,Product
FROM
Calendar CROSS JOIN ProfileRate
where DateRate between '2020-05-01' and '2020-05-05'
),
DetailForCalendar as
(
select IdCalendar,Rate,Product
from DataForCalendar
where DateRate between FirstDate and LastDate
),
TotalForCalendar as
(
select IdCalendar,Product,sum(Rate)As Total from DetailForCalendar
GROUP BY IdCalendar,Product
)
select Calendar.IdCalendar,Calendar.FirstDate,Calendar.LastDate,
TotalForCalendar.Product,TotalForCalendar.Total
from TotalForCalendar inner join
Calendar on TotalForCalendar.IdCalendar=Calendar.IdCalendar;
in this example you can find step by step how it work
in this example there is one more product and one more calendar.

Answer 2

I think this is a JOIN and conditional aggregation:
SELECT c.FirstDate, c.LastDate,
SUM(CASE WHEN pr.prod = 'Prod1' THEN pr.Rate END) as prod1,
SUM(CASE WHEN pr.prod = 'Prod2' THEN pr.Rate END) as prod2
FROM Calender c LEFT JOIN
ProfileRate pr
ON pr.Date >= c.FirstDate AND pr.Date <= c.LastDate
GROUP BY c.FirstDate, c.LastDate;

Answer 3

Do the join & conditional aggregation :
select c.fisrtdate, c.lastdate,
sum(case when pr.product = 'prod1' then rate else 0 end) as prod1,
sum(case when pr.product = 'prod2' then rate else 0 end) as prod2
from calendar c join
ProfileRate pr
on pr.date >= c.fisrtdate and pr.date <= c.lastdate
group by c.fisrtdate, c.lastdate;
If you want all calendar dates then use left join instead.