title: Excel SQL External Data Return All Results If Parameter Is Empty
body: <p>Good Morning,</p>
  
  <p>I am connecting to an external data source in Excel using SQL to retreive the records.
  Returning the data is fine when I specify a value for the paramter I have defined.</p>
  
  <p>What I am wanting to achieve is if the parameter (linked to a cell) is blank/empty then to return all records.</p>
  
  <p>I'm not too sure how to state this but the paramter is in the WHERE clause of the SQL
  e.g. <code>WHERE (Specialty.SpecialtyCODE = ?)</code></p>
  
  <p>Regards
  Dino</p>