title: How to add and subtract weekends when adding dates in oracle sql?
body: <p>below is my code</p>
  <pre><code>  to_date('2021-01-05', 'yyyy-mm-dd')+15
  </code></pre>
  <p>If you add a date like this:
  '2021-01-16' appears.</p>
  <p>But the result I want is '2021-01-22', excluding weekends.</p>
  <p>How can I get this result?</p>