title: SQL delete except select result
body: <p>I have these 3 tables, and i want to delete from all records except some already used request</p>
  <ol>
  <li>Registry</li>
  <li>Record</li>
  <li>Request</li>
  </ol>
  <p>and i use this query which brings me all the rows i want to delete.</p>
  <pre><code>select *  from Record where RegistryId = 'aa6598'
  except
  select * from Record where Id in ( select RecordId from Request where RegistryId = 'aa6598')
  </code></pre>
  <p>How to use delete in this case?</p>