title: Oracle: Insert default value 0 into timestamp column
body: <p>Is it possible to insert a default value of 0 into an oracle <code>timestamp(6)</code> column? </p>
  
  <p>I have a column <code>CS_Date_Time</code> defined as <code>Timestamp(6) NOT NULL</code>. In certain cases it is not valid to insert any value to this column. So instead of changing the definition to allow <code>NULL</code> values and leaving this column as <code>NULL</code> in these cases, I was looking for any alternatives.</p>