Finding duplicate in SQL Server Table

Question

I have a table

+--------+--------+--------+--------+--------+
| Market | Sales1 | Sales2 | Sales3 | Sales4 |
+--------+--------+--------+--------+--------+
|            


        

Answer 1

Supposing the data size is not so big, make a new temporay table joinning all data:

Sales 
Market

then select grouping by Sales and after take the ones bigger than 1:

select Max(Sales), Count(*) as Qty 
from #temporary 
group by Sales