title: Oracle named constraint in create table to set date to default date
body: <p>I want to add a named constraint in my <code>CREATE TABLE</code> statement that will cause of my columns to default to the system date.  I know how to define a primary key constraint:</p>
  
  <pre><code>constraint cust_ID_PK PRIMARY KEY (Cust_ID)
  </code></pre>
  
  <p>How do I define a constraint on <code>Hire_Date</code> that defaults it to the system date?</p>