title: In SQL, How to select not duplicate values?
body: <pre><code>$country = $row['COUNTRY'];
  </code></pre>
  <p>COUNTRY</p>
  <pre><code>Singapore
  Japan
  China
  China
  Singapore
  Japan
  China
  Malaysia
  Malaysia
  South Korea
  Malaysia
  </code></pre>
  <p>All records contains duplicate values except South Korea. I want to select South Korea using variable. without using Id.</p>