title: How to find a range of given number?
body: <p>I have a table like below and I want to find the range of inputted number.
  ex) if users enters 84, MySql query returns B. </p>
  
  <pre><code>Rank  Range_Start Range_End
  A       90          100
  B       80          89
  C       70          79
  .
  .
  H
  I        0          10
  </code></pre>