title: How to fix the ALTER TABLE statement conflicted with the FOREIGN KEY constraint
body: <p>Unable to create a relationship 'FK_Sales_Date'. </p>
  
  <p>The <code>ALTER TABLE</code> statement conflicted with the FOREIGN KEY constraint "FK_Sales_Date". The conflict occurred in database "SalesDataWarehouse", table "dbo.Date", column 'DateKey'.</p>