title: MySQL "NULL" questions
body: <p>I have a table with several columns.</p>
  
  <p>Sometimes some of these column fields may be empty (ie. I won't use them in some cases).</p>
  
  <p>My questions:</p>
  
  <ol>
  <li><p>Would it be smart to set them to NULL in phpmyadmin?</p></li>
  <li><p>What does the "NULL" property actually do?</p></li>
  <li><p>Would I gain anything at all by setting them to NULL?</p></li>
  <li><p>Is it possible to use a NULL field the same way even though it is set to null?</p></li>
  </ol>