Gather cumulative weekly sales using SQLServer management studio - sql-server

Question

My query gather a technician daily sales data.
select
SUM(O.SUB_TOTAL) AS TOTALSALES,
COUNT(DISTINCT O.ORDER_NO) AS BILLABLEORDERS
FROM ordhdr o
INNER JOIN schedule s ON s.ID_VAL = o.ORDER_NO
WHERE
s.DATE = Convert(varchar(10), GETDATE()-1,121)
AND O.[TYPE] = 'SVC'
However, I also want to get weekly cumulative sales to know whether he is on track or not for his weekly numbers but I struggling transforming the query.
This has to reset for each Sunday or Monday so I cannot use a CurrentDate-7 function.
I don't know how to only look at a CURRENT weeks data using SQL-Server Management Studio.

Answer 1

Look into the 'DatePart' function. You can use it to identify which week out of the year a given date resides in, and it seems to turn over on Sunday. For instance:
datepart(week, '2019-07-06') -- Saturday, returns 27
datepart(week, '2019-07-07') -- Sunday, returns 28
That alone should get you going. However, you can throw in a few more techniques to get all the information in one resultset.
Consider the following ordhdr table:
declare #ordhdr table (
order_no int,
sub_total decimal(8,2),
type varchar(15)
);
insert #ordhdr values
(1, 23.25, 'svc'),
(2, 324.23, 'svc'),
(3, 423.89, 'svc'),
(4, 324.80, 'svc'),
(5, 234.23, 'svc'),
(6, 923.23, 'svc');
... and the following schedule table:
declare #schedule table (id_val int, date date);
insert #schedule values
(1, '2019-07-04'),
(2, '2019-07-04'),
(3, '2019-07-08'),
(4, '2019-07-09'),
(5, '2019-07-09'),
(6, '2019-07-10');
Well, using datepart, datename, cross apply, and grouping sets, you can do this:
select ap.year,
ap.weekOfYear,
dayOfWeek =
case
when ap.weekOfYear is null then '<entire year>'
when ap.dayOfWeek is null then '<entire week>'
else ap.dayOfWeek
end,
s.date,
totalsales = sum(o.sub_total),
billableorders = count(distinct o.order_no)
from #ordhdr o
join #schedule s on s.id_val = o.order_no
cross apply (select
year = datepart(year, s.date),
weekOfYear = datepart(week, s.date),
dayOfWeek = datename(weekday, s.date)
) ap
where o.type = 'svc'
group by grouping sets (
(ap.year, ap.weekOfYear, ap.dayOfWeek, s.date),
(ap.year, ap.weekOfYear),
(ap.year)
)
order by weekOfYear, date
Which will give you daily, weekly, and yearly totals.