title: SQL exclude weekends and public/bank holidays
body: <p>In my table I have a column full of dates. All the dates are from the start of 2021 till now only.</p>
  <p>I'm currently using this code to get a count of the distinct timestamps:</p>
  <pre><code>SELECT COUNT(DISTINCT TRUNC(order_timestamp))
  </code></pre>
  <p>Is there anything I can add to this code or after to exclude the weekends?</p>