SQL Server - How to filter data based on data combination from two or more columns

Question

I was trying to filter out data in the dashboard based on two fields, for example, product category and year.

I have data where some products are sold in 2007, 2008, and 2009, while others are sold only in 2008. I want to exclude data where sale data for products with only 2008 year as the sale year.

For example,

BrandName	Year
Toys	2008
Footwear	2008
Cookware	2008
Toys	2009
Toys	2007
Footwear	2009
Footwear	2007
Clothes	2008

Expected output:

BrandName	Year
Toys	2008
Footwear	2008
Toys	2009
Toys	2007
Footwear	2009
Footwear	2007

I tried following SQL but does not seem to work

Select BrandName, Concat(BrandName,Year(UpdateDate)), SOUNDEX(Concat(BrandName,Year(UpdateDate))) as Data from Dbo.DimProduct
Group by BrandName, Concat(BrandName,Year(UpdateDate))
having Count(SOUNDEX(Concat(BrandName,Year(UpdateDate)))) > 1
Order by SOUNDEX(Concat(BrandName,Year(UpdateDate)))

Basically, if there is only one record like Clothes2008 and Cookware2008, exclude them from the resultset.

Answer 1

Please try the following solution.

SQL

-- DDL and sample data population, start
DECLARE @tbl TABLE (ID INT IDENTITY PRIMARY KEY, ProductCategory VARCHAR(30), _year CHAR(4));
INSERT INTO @tbl (ProductCategory, _year) VALUES
('Toys', '2008'),
('Footwear', '2008'),
('Cookware', '2008'),
('Toys', '2009'),
('Toys', '2007'),
('Footwear', '2009'),
('Footwear', '2007'),
('Clothes', '2008');
-- DDL and sample data population, end

;WITH rs AS
(
    SELECT * 
       , total_count = COUNT(*) OVER (PARTITION BY ProductCategory ORDER BY ProductCategory)
       , _2008_count = SUM(IIF (_year='2008', 1, 0)) OVER (PARTITION BY ProductCategory ORDER BY ProductCategory)
    FROM @tbl
)
SELECT ID, ProductCategory, _year 
FROM rs
WHERE total_count <> _2008_count
ORDER BY ID;

Output

+----+-----------------+-------+
| ID | ProductCategory | _year |
+----+-----------------+-------+
|  1 | Toys            |  2008 |
|  2 | Footwear        |  2008 |
|  4 | Toys            |  2009 |
|  5 | Toys            |  2007 |
|  6 | Footwear        |  2009 |
|  7 | Footwear        |  2007 |
+----+-----------------+-------+