title: Deleting hierarchical data in SQL table
body: <p>I have a table with hierarchical data.<br>
  A column "ParentId" that holds the Id ("ID" - key column) of it's parent.</p>
  
  <p>When deleting a row, I want to delete all children (all levels of nesting).</p>
  
  <p>How to do it? </p>
  
  <p>Thanks</p>