title: Using ISNULL or COALESCE on date column
body: <p>I’ve got a date column where some rows have got NULL values. I would like to use ISNULL or something like that to substitute those values with something like ‘N/A’, however, when I try to use ISNULL, I get an error due to two different data types. If I try to convert my Date column to VARCHAR in order to be able to use ISNULL, then the way my column displays dates gets distorted. Is there any way to solve this problem?</p>
  
  <pre><code>ISNULL(DateSent, 'N/A')
  </code></pre>