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WITH
  cteTotalSales (SalesPersonID, NetSales)
  AS
  (
    SELECT SalesPersonID, ROUND(SUM(SubTotal), 2)
    FROM Sales.SalesOrderHeader
    WHERE SalesPersonID IS NOT NULL
    GROUP BY SalesPersonID
  );
SELECT
  sp.FirstName + ' ' + sp.LastName AS FullName,
  sp.City + ', ' + StateProvinceName AS Location,
  ts.NetSales
FROM Sales.vSalesPerson AS sp
  INNER JOIN cteTotalSales AS ts
    ON sp.BusinessEntityID = ts.SalesPersonID
ORDER BY ts.NetSales DESC