Question

I have a table with 250 columns. I’m trying to Select all columns, but I want to use DISTINCT for two columns.

My begin it’s sometihing like that:

SELECT *
FROM table_name
WHERE EXISTS (SELECT DISTINCT table_name.column_name FROM table_name).

But doesn’t work.
Maybe somebody has any ideas?
Thanks in advance.

Answer 1

SELECT * 
FROM table_name t
WHERE NOT EXISTS (SELECT 1 
                  FROM table_name tt 
                  WHERE tt.col1 = t.col1 
                    AND tt.col2 = t.col2 
                    AND tt.id > t.id)