Selecting Distinct field and row num just to display an id number gives duplicated data

Question

I have a table application and it has 10 columns. category is one column and this column has duplicated values. To get distinct values I have a query

SELECT distinc

Answer 1

Try using this

SELECT DISTINCT(CATEGORY) AS CategoryName, 
       ROW_NUMBER() OVER (ORDER BY CATEGORY) AS categoryId
FROM APPLICATION 
WHERE applications =?