title: Explicitly set column value to null SQL Developer
body: <p>I am new to Oracle DB and I am using Oracle SQL Developer (Ver 3.0.02) to query the DB.
  I wanted to explicitly set one column to null?</p>
  
  <p>How do I do that in the SQL Developer GUI?</p>
  
  <p>Previously in MSSQL, clicking CTRL+0 will explicitly set the value to null.
  How about Oracle SQL Developer?
  Thanks</p>