In our database we have Latin and Cyrillic alphabets and all is fine with those characters. But, sometimes people enter characters that appear as ? or squares. Is there a way to find those specific symbols, because looking manually through a couple of tables with >400 000 records for 1 mistake is insane.

I have looked for online solutions that I can load my data as text, I have tried notepad , but either I get all Cyrillic marked or I don't get anything.

EDIT: L.