I get a question mark or inverted question mark when selecting back just inserted characters?
When characters are converted between the client and the database character set, or vice versa, the character should exist in both. If it does not exist in the character set being converted to (the destination) then a replacement character is used. Some character sets have specific replacement characters defined when translating from other specific character sets but where this is not done a default replacement character, such as a ?, is used. Conversion from a replacement character back to the original character is not possible.
