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-- Dividing rows into 2 groups
SELECT p.FirstName, p.LastName
,NTILE(2) OVER(ORDER BY SalesYTD DESC) AS Quartile
, a.PostalCode
FROM Sales.SalesPerson AS s
INNER JOIN Person.Person AS p
ON s.BusinessEntityID = p.BusinessEntityID
INNER JOIN Person.Address AS a
ON a.AddressID = p.BusinessEntityID
WHERE SalesYTD <> 0;
-- Partition by Postal Code
-- And then divided into four groups within
-- each PostalCode.
SELECT p.FirstName, p.LastName
,NTILE(4) OVER(PARTITION BY PostalCode
ORDER BY SalesYTD DESC) AS Quartile
,a.PostalCode
FROM Sales.SalesPerson AS s
INNER JOIN Person.Person AS p
ON s.BusinessEntityID = p.BusinessEntityID
INNER JOIN Person.Address AS a
ON a.AddressID = p.BusinessEntityID
WHERE TerritoryID IS NOT NULL
AND SalesYTD <> 0;
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