Using distinct on a column and doing order by on another column gives an error

Question

I have a table: abc_test with columns n_num, k_str.

This query doesnt work:

    select distinct(n_num) from abc_test order by(k_str)

B

Answer 1

When I got same error, I got it resolved by changing it as

SELECT n_num 
FROM(
   SELECT DISTINCT(n_num) AS n_num, k_str
   FROM abc_test
) as tbl
ORDER BY tbl.k_str