Distinct with Count and SQl Server 2005 - sql-server

Question

Trying to work on a query that will return the top 3 selling products with the three having a distinct artist. Im getting stuck on getting the unique artist.
Simplified Table schema
Product
ProductID
Product Name
Artist Name
OrderItem
ProductID
Qty
So results would look like this...
PID artist qty
34432, 'Jimi Hendrix', 6543
54833, 'stevie ray vaughan' 2344
12344, 'carrie underwood', 1

Answer 1

Use this:
with summed_sales_of_each_product as
(
select p.artist_name, p.product_id, sum(i.qty) as total
from product p join order_item i
on i.product_id = p.product_id
group by p.artist_name, p.product_id
),
each_artist_top_selling_product as
(
select x_in.artist_name, x_in.product_id, x_in.total
from summed_sales_of_each_product x_in where total =
(select max(x_out.total)
from summed_sales_of_each_product x_out
where x_out.artist_name = x_in.artist_name)
)
select top 3
artist_name, product_id, total
from each_artist_top_selling_product
order by total desc
But you cannot stop at that query, how about if there are two products on one artist that are ties on highest selling? This is how the data like this...
beatles yesterday 1000
beatles something 1000
elvis jailbreak rock 800
nirvana lithium 600
tomjones sexbomb 400
...will result to following using the above query:
beatles yesterday 1000
beatles something 1000
elvis jailbreak rock 800
Which one to choose? yesterday or something? Since you cannot arbitrarily chose one over the other, you must list both. Also, what if the top 10 highest selling belongs to beatles and are ties, each with a quantity of 1000? Since that is the very best thing you are avoiding(i.e. reporting same artist on top 3), you have to amend the query so the top 3 report will look like this:
beatles yesterday 1000
beatles something 1000
elvis jailbreak rock 800
nirvana lithium 600
To Amend:
with summed_sales_of_each_product as
(
select p.artist_name, p.product_id, sum(i.qty) as total
from product p join order_item i
on i.product_id = p.product_id
group by p.artist_name, p.product_id
),
each_artist_top_selling_product as
(
select x_in.artist_name, x_in.product_id, x_in.total
from summed_sales_of_each_product x_in
where x_in.total =
(select max(x_out.total)
from summed_sales_of_each_product x_out
where x_out.artist_name = x_in.artist_name)
),
top_3_total as
(
select distinct top 3 total
from each_artist_top_selling_product
order by total desc
)
select artist_name, product_id, total
from each_artist_top_selling_product
where total in (select total from top_3_total)
order by total desc
How about if the beatles has another product which has 900 qty? Will the above query still work? Yes, it will still work. Since the top_3 CTE only concerns itself from the already filtered top qty on each artist. So this source data...
beatles yesterday 1000
beatles something 1000
beatles and i love her 900
elvis jailbreak rock 800
nirvana lithium 600
tomjones sexbomb 400
...will still result to following:
beatles yesterday 1000
beatles something 1000
elvis jailbreak rock 800
nirvana lithium 600

Answer 2

If I have understood your schema correctly, you should be able to do it like this:
select top 3 * from(
select p.ProductId, p.ArtistName, sum(o.qty) as qty from Product p, OrderItem o
where p.ProductId = o.ProductId
group by p.productId, p.ArtistName
order by sum(o.qty)
)

Answer 3

I don't know what you want to do if an Artist has two top-ranked products with identical sales--this will return two in case of a tie.
If you want to add another criteria, such as "most recent", you have to add that to both subqueries.
select top 3 sales_by_item.ProductID,
sales_by_item.Artist,
sales_by_item.Qty
from
(
select * from product x
inner join OrderItem y
on x.productid = y.productid
group by productid, Artist
) sales_by_item
inner join
(
select artist, max(qty) as maxqty
from product x
inner join OrderItem y
on x.productid = y.productid
group by artist
) max_by_artist
on sales_by_item.artist = max_by_artist.artist
and sales_by_item.qty = max_by_artist.maxqty
order by sales_by_item.qty
Edited to make subquery names more descriptive

Answer 4

Second attempt. I’m not in a position to test this code, and I’m not sure if I’ve got that “partition by” clause configured correctly. The idea is:
The inner query gets the sum of Qty for all product/artists, and uses the row_number() function to number them starting with the largest, and resets the ordering for each artist. (This can be done, but my syntax may be off.)
The outer query picks out the first (largest) item for each artist, and returns only the first three (ordere by Qty)
If an artists top two products tie for total Qty, I arbitrarily break the tie in favor of the “earliest” album.
(I try to avoid using "Top n", but it's late and I don't want to tackle another row_number() function.)
SELECT top 3
ProductId
,ArtistName
,Qty
from (-- Products + Artists by total qty
select
pr.ProductId
,pr.ArtistName
,sum(oi.Qty) Qty
,row_number() over (partition by pr.ArtistName order by pr.ArtistName, sum(oi.Qty) desc, pr.ProductId) Ranking
from Product pr
inner join OrderItem oi
on oi.ProductID = pr.ProductID
group by pr.ProductId, pr.ArtistName) BestSellers
where Ranking = 1
group by ProductId, ArtistName) BestArtists
order by Qty desc

Answer 5

Analyzing your request, it sounds like the results should be the highest product quantity for the top three artists. So, if Jimi Hendrix has the top 10 product quantities and Stevie Ray Vaughan is 11th, you want Jimi with his highest product then Stevie with his highest product.
With ProductRanksForArtists As
(
Select P.ProductId, P.ArtistName, Sum(O.Qty) As Total
, ROW_NUMBER OVER( PARTITION BY P.ArtistName ORDER BY Sum(O.Qty) DESC ) As ProductRank
From Product As P
Join OrderItem As O
On O.ProductId = P.ProductId
Group By P.ProductId, P.ArtistName
)
, HighestProductForArtists As
(
Select ProductId, ArtistName, Total
, ROW_NUMBER OVER( ORDER BY Total DESC ) As TotalRank
From ProductRanksForArtists
Where ProductRank = 1
)
Select ProductId, ArtistName, Total
From HighestProductForArtists
Where TotalRank <= 3

Answer 6

Try this
Select top 3 artist, count(artist) from tablename group by artist order by artist count(artist) desc