How to find duplicates in 2 columns not 1

Question

I have a MySQL database table with two columns that interest me. Individually they can each have duplicates, but they should never have a duplicate of BOTH of them having th

Answer 1

You should set up a composite key between the two fields. This will require a unique stone_id and upcharge_title for each row.

As far as finding the existing duplicates try this:

select   stone_id,
         upcharge_title,
         count(*)
from     your_table
group by stone_id,
         upcharge_title
having   count(*) > 1