title: SQL NULL Condition
body: <p>I'm new to development. In sql I have written a stored procedure and
  it is working correctly but I just wanted to make sure it is done the correct way. </p>
  
  <p>Here I am using an IF statement in sp to check whether date column in a table is NULL or not:</p>
  
  <pre><code>  if ((select sdate 
         from tbla 
           where id='3') = Null)
  begin
    some query
  end
  </code></pre>
  
  <p>Will this work for all cases or do I need to check for ''(empty) also?</p>