title: Data Vault - How to select business keys?
body: <p>If the following three unique attributes arrive from a SalesOrderHeader table in a 3NF model, which one would be the ideal business key for a SalesOrderHeader Hub:</p>
  
  <ol>
  <li>SalesOrderID(PK of the original table)</li>
  <li>SalesOrderNumber</li>
  <li>PurchaseOrderNumber</li>
  </ol>