title: Add string to query result
body: <p>I have the following query:</p>
  <pre><code>select point_delivery_number, bin(time,1h) as time , AVG(self_coverage) as self_coverage , AVG(generation) as generation , AVG(consumption) as consumption
  from &quot;energy_datapoints&quot;.&quot;formatted_group_raw&quot;
  GROUP BY point_delivery_number, bin(time, 1h) 
  ORDER BY time desc
  </code></pre>
  <p>The result is following:</p>
  <p><a href="https://i.stack.imgur.com/8mRj2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8mRj2.png" alt="enter image description here" /></a></p>
  <p>I want to add an <code>Z</code> to the time to indicate thats an UTC time format</p>
  <p>Result should be then:</p>
  <pre><code>AT..... | 2021-05-31 21:00:00.00000Z | ... | ... | ... 
  </code></pre>
  <p>I tried to use CONCAT</p>
  <pre><code>CONCAT(bin(time,1h), 'Z') as time
  </code></pre>
  <p>It says:</p>
  <blockquote>
  <p>line 1:31: Unexpected parameters (timestamp, varchar(1)) for function
  'CONCAT'</p>
  </blockquote>
  <p>Is there maybe an better way of doing this?</p>