title: Return maximum occurring character in an input string though Oracle SQL
body: <p>Say if I have fruit names like Papaya,Orange,etc row by row...</p>
  <p>How will I find the maximum occuring character in each string.
  For Papaya it will be 'a' as it was repeated 3 times
  For Orange it will be all the characters as for each character it was repeated one time only
  I need to solve the above query using Oracle SQL</p>