Split data datetime wise in SQL Server - sql

Question

I have a requirement to group the data day-wise from 8:00 AM today to 7:59 AM the next day as 1 full day.
For example from the below table:
SoldDatetime Qty
Dec 20,2015 12:05 AM 1
Dec 20,2015 1:05 AM 2
Dec 20,2015 7:05 AM 3
Dec 20,2015 8:05 AM 4
Dec 20,2015 10:05 AM 5
Dec 20,2015 11:05 PM 6
Dec 21,2015 12:05 AM 7
Dec 21,2015 1:05 AM 8
Dec 21,2015 7:05 AM 9
Dec 21,2015 8:05 AM 10
Dec 21,2015 10:05 AM 11
Dec 21,2015 11:05 PM 12
Dec 22,2015 12:05 AM 13
Dec 22,2015 1:05 AM 14
Dec 22,2015 7:05 AM 15
Dec 22,2015 8:05 AM 16
Dec 22,2015 10:05 AM 17
Dec 22,2015 11:05 PM 18
Dec 23,2015 12:05 AM 19
Dec 23,2015 1:05 AM 20
Dec 23,2015 7:05 AM 21
Dec 23,2015 8:05 AM 22
Dec 23,2015 10:05 AM 23
Dec 23,2015 11:05 PM 24
Dec 24,2015 12:05 AM 25
Dec 24,2015 1:05 AM 26
Dec 24,2015 7:05 AM 27
Dec 24,2015 8:05 AM 28
Dec 24,2015 10:05 AM 29
Dec 24,2015 11:05 PM 30
Dec 25,2015 12:05 AM 31
Dec 25,2015 1:05 AM 32
Dec 25,2015 7:05 AM 33
Dec 25,2015 8:05 AM 34
Dec 25,2015 10:05 AM 35
Dec 25,2015 11:05 PM 36
If I have to run a query to filter for date range Dec 21,2015 8:00 AM to Dec 25,2015 7:59 AM. I need the output in below format
SoldDateRange Qty
Dec 20,2015 8:00 AM - Dec 21,2015 7:59AM 39
Dec 21,2015 8:00 AM - Dec 22,2015 7:59AM 75
Dec 22,2015 8:00 AM - Dec 23,2015 7:59AM 111
Dec 23,2015 8:00 AM - Dec 24,2015 7:59AM 147
Dec 24,2015 8:00 AM - Dec 25,2015 7:59AM 183
Can someone help with the SQL query for this? Thanks in advance

Answer 1

Here is a query which should give you the full output you mentioned in your original question.
SELECT CONCAT(CONVERT(VARCHAR, t.adjustedTime, 107), ' 8:00 AM',
' - ',
CONVERT(VARCHAR, DATEADD(DAY, 1, t.adjustedTime), 107), ' 7:59AM'),
t.Qty
FROM
(
SELECT CAST(DATEADD(HOUR, -8, SoldDateTime) AS DATE) AS adjustedTime, SUM(Qty) AS Qty
FROM yourTable
GROUP BY CAST(DATEADD(HOUR, -8, SoldDateTime) AS DATE)
) t
ORDER BY t.adjustedTime

Answer 2

You can do this by subtracting 8 hours. The basic idea is:
select cast(dateadd(hour, -8, solddaterange) as date) as SoldDate, sum(qty)
from t
group by cast(dateadd(hour, -8, solddaterange) as date)
order by SoldDate;
EDIT:
You could use the same idea. For instance:
where cast(dateadd(hour, -8, solddaterange) as date) = '2016-01-01'