Getting the daily sales report given the date - sql

Question

Given a date, the table displays the items sold on that date.
The table groups the category of the items and show the total sales value for each category. At the end, the report shows the total sales value for the day(s). Something like this:
ID Category Price Units Total Value
----------------------------------------------------
2244 class 10.50 10 105.00
2555 class 5.00 5 25.00
3455 class 20.00 1 20.00
Total 16 150.00
1255 pop 20.00 5 100.00
5666 pop 10.00 10 100.00
Total 15 200,00
1244 rock 2.50 20 50.00
8844 rock 5.00 50 250.00
Total 70 300.00
----------------------------------------------
Total Daily Sales 101 650.00
DBMS: SQL Server 2012
Bolded: primary keys
Item (upc, title*, type, category, company, year, price, stock)
PurchaseItem (receiptId, upc, quantity)
Order (receiptId, date, cid, card#, expiryDate, expectedDate, deliveredDate)
Rough work of what I have so far..
SELECT I.upc, I.category, I.price, P.quantity, P.quantity*I.price AS totalValue, SUM(totalValue), SUM(P.quantity) AS totalUnits, O.date
FROM Item I, Order O
JOIN (SELECT P.quantity
FROM PurchaseItem P, Item I
WHERE I.upc = P.upc)
ON I.upc = P.upc
WHERE O.date = ({$date}) AND O.receiptId = P.receiptId
GROUP BY I.upc, I.category, I.price, P.quantity, totalValue, O.date
Alright, this isn't right and I'm kind of stuck. Need some help!
I want it so it produces the total value of items from one category then in the end, it will add up the total value of the items from all categories.
SAMPLE TABLES
Item(2568, Beatles, rock, Music Inc, 1998, 50.50, 5000)
PurchaseItem (5300, 2568, 2)
Order (5300, 10/09/2014, ...Not important..) cid is customerId and card# is credit card number.

Answer 1

SSRS or a similar reporting package can usually handles this for you natively. If this has to be done in SQl script then a quick solution would be a cursor/while loop. pseudo code would look like this;
create tempsales table;
get distinct list of categories;
for each category
Begin
insert into tempsale (...)
sales where category = #category
group by category, item
insert into tempsales (...) -- use NULL value for item or perhaps a value of 'TOTAL'
Sales where category = #category
group by category
when last category
insert into tempsales (...) -- use NULL value for item AND Category or perhaps a value of 'TOTAL'
total with no group
end
select from tempsales;

Answer 2

See if this helps:
CREATE SAMPLE DATA
use tempdb;
create table Item(
upc int,
category varchar(100),
price decimal(8,2)
)
create table PurchaseItem(
receiptId int,
upc int,
quantity int
)
create table [Order](
receiptId int,
[date] date
)
insert into Item values
(2244, 'class', 10.50),
(2555, 'class', 5.0),
(3455, 'class', 20.0),
(1255, 'pop', 20.0),
(5666, 'pop', 10.0),
(1244, 'rock', 2.50),
(8844, 'rock', 5.0)
insert into PurchaseItem values
(5300, 2244, 10),
(5300, 2555, 5),
(5300, 3455, 1),
(5300, 1255, 5),
(5300, 5666, 10),
(5300, 1244, 20),
(5300, 8844, 50)
insert into [Order] values(5300,'20140910')
SOLUTION
;with cte as(
select
i.upc as Id,
i.category as Category,
i.price as Price,
p.quantity as Units,
price * quantity as TotalValue
from [Order] o
inner join PurchaseItem p
on p.receiptId = o.receiptId
inner join Item i
on i.upc = p.upc
)
select
Id,
case
when grouping(Id) = 1 then 'Total'
else Category
end as Category,
Price,
sum(Units) as Units,
sum(TotalValue) as TotalValue
from cte
group by
grouping sets(Category, (Category, Id, Price, Units, TotalValue))
union all
select
null,
'Total Daily Sales',
null,
sum(Units),
sum(Totalvalue)
from cte
DROP SAMPLE DATA
drop table item
drop table PurchaseItem
drop table [Order]