title: ASCII (?) Special characters issue
body: <p>I have a contact table where it stores names of the contact persons. So our research team copies the names from websites and pastes it into application, while copying we got some special characters got stored into database. Check below examples which will reflect as "?"(ASCII code=63) while extracted to text file. Examples of contact Last names are listed as follows.</p>
  
  <p>EX: 1) Shefﬁeld
  2) Grifﬁn-Smith
  3) Lhoёst</p>
  
  <p>Is there a way to query list of all special characters available with ASCII code as 63 in the "Last_name" column of my contact table so that I could figure out and send them to researchers to update the correct names.</p>
  
  <p>Thanks in advance!</p>