title: Date Paramter won't work in SQL for ISNULL column
body: <p>I have a table with a date column in it.  I am currently using ISNULL to set all NULL date values to a 1/1/2001 so it looks like so.</p>
  
  <pre><code>Select ISNULL(DateColumn,'1/1/2001') AS DateColumn, PartNumber
  From Table
  Where DateColumn &lt; '1/1/1990'
  </code></pre>
  
  <p>It seems the created date '1/1/2001' appears on any generated list , regardless of the filter.</p>
  
  <p>Any suggestions?</p>