Cross tab query is not aggregating results - sql-server

Question

I was working from the fiddle example to create a cross tab view. Essentially, I received a table with Customers, Vendors and Product Type. I want to generate a view where the vendors are the rows and the columns are the total sales by product type.
The structure is
CustomerID Vendor ProductType
--------------------------------
1 A Type1
2 A Type2
3 B Type1
4 A Type2
The end result I want is:
Vendor Type1 Type2
---------------------
A 1 2
B 1 0
/* Count the number of sales by Product Type for each Vendor. */
DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX)
select #cols = STUFF((SELECT DISTINCT ',' + QUOTENAME(ProductType)
from MyTable
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query = 'SELECT Vendor,' + #cols + '
from MyTable
pivot
(
count (ProductType)
for ProductType in (' + #cols + ')
) p
ORDER BY Vendor ASC'
execute(#query)
The end result is multiple rows for each vendor instead of a single row with the aggregated counts.
E.g.
Vendor Type1 Type2
---------------------
A 1 0
A 0 1
B 1 0
A 0 1
Does anyone have any insight into what I may have missed with this query?
Thanks.

Answer 1

I would suggest that you use a subquery to select the columns that you need from your table. The problem is that your data is being grouped by the vendor and the customerId. The customerId is distinct for each row, changing your query to the following will give you the result:
DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX)
select #cols = STUFF((SELECT DISTINCT ',' + QUOTENAME(ProductType)
from MyTable
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query
= 'SELECT Vendor,' + #cols + '
from
(
select vendor, producttype
from MyTable
) d
pivot
(
count (ProductType)
for ProductType in (' + #cols + ')
) p
ORDER BY Vendor ASC'
execute(#query);
See SQL Fiddle with Demo. This gives a result:
| VENDOR | TYPE1 | TYPE2 |
| A | 1 | 2 |
| B | 1 | 0 |