title: SQL: Replacing Multiple Nulls with unique values
body: <p>For example, if column1 has a bunch of descriptions and multiple NULLs, and I want to replace each NULL with a unique description. </p>
  
  <p>using a COALESCE function I can do </p>
  
  <p><code>COALESCE(Column1,'Description')</code></p>
  
  <p>and this will replace every NULL in the column with "description", how can I adress each NULL individually and not replace all of them with the same value?</p>