How to get the first and the last record of every month within a time range in sql

Question

I am trying to get the first record and the last record of each and every month in a given date range using sql. I have a sample code
where i have just selected everything within the date range now i have to extract the first and the last records of each and every month.
SELECT PurOrderNum,
OrderDate
FROM Purchasing.PurOrder
WHERE OrderDate >= '2013-02-28'
AND OrderDate <= '2014-12-29'

Answer 1

SELECT PurOrderNum,
OrderDate
FROM
SELECT PurOrderNum,
OrderDate,
MAX(OrderDate) OVER (PARTITION BY DATEDIFF(mm,0,OrderDate)) AS MaxDate,
MIN(OrderDate) OVER (PARTITION BY DATEDIFF(mm,0,OrderDate)) AS MinDate
FROM Purchasing.PurOrder
WHERE OrderDate >= '2013-02-28'
AND OrderDate <= '2014-12-29'
)t
WHERE OrderDate = MaxDate
OR OrderDate = MinDate
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