title: Returning a default value in SQL when no rows found
body: <p>How can change my SQL to return a default value if no rows are found?</p>
  
  <p>Eg:</p>
  
  <pre><code>select text,name from text_file where text='met'
  </code></pre>
  
  <p>If no rows are found, I would like text to contain 'Values not found' for example</p>