title: How to Pass current date if there is null value in the field?
body: <p>FORMAT(a.[Installation Date], 'G') as Installed, </p>
  
  <p>Here i am passing the date values from installed date to Installed.
  I am looking for a syntax to check if the field has null value, then current date needs to be passed to installed.</p>
  
  <p>Regards,
  Ravi </p>