title: Update bytea data with NULL in postgresql
body: <p>I have a bytea field which contains data I want to replace with NULL. I tried the following syntax:</p>
  
  <pre><code>update ir_act_report_xml set report_rml_content_data = E'\\000'::bytea, report_sxw_content_data = E'\\000'::bytea where id = 365;
  </code></pre>
  
  <p>But it then returns 00 instead of being NULL.</p>
  
  <p>What is the correct syntax for updating the bytea field to NULL?</p>