Getting Changed [Status] rows between multiple rows in SQL Server 2012 based on MonthYear Field

Question

I am trying create Stored Proc which takes 2 inputs from user  @PreviousMonthYear,@CurrentMonthYear
Below is my table schema.[TableIPPortStatus]
Such 1000's of rows will be available in TableIPPortStatus for every IP Port combination for every Scan. Stored Proc will take input as @PreviousMonthYear = 'Jan-2013' and @CurrentMonthYear = 'Feb-2013'
Expected stored proc o/p is to get changed status in @CurrentMonthYear rows compared with the same IP/Port combination from @PreviousMonthYear rows. so for for above e.g. expecting to get below result.
Since in Scan 2222 Port 80 of IP 1.0.0.0 got closed & Port 80 of IP 1.0.0.1 got open and for 1.0.0.2 status was unchanged.
Also, if any new IPPort combination is added in Feb-2013 that needs to make available in the output.
Please suggest way to accomplish this in SQL. Thanks in Advance!

Answer 1

DId you try this? ACtually you dont even need prevmonthyear parameter. you can simply get result using single parameter
If its sql 2012 this is very easy
DECLARE @CurrentMonthYear varchar(30)
SET @CurrentMonthYear = 'Feb-2013'
SELECT ScanId,MonthYear,IP,Port,Status
FROM
SELECT *,
LAG(Status,1,'') OVER (PARTITION BY IP,Port ORDER BY CAST('01-' + MonthYear AS datetime)) AS PrevStatus
FROM Table
)t
WHERE PrevStatus <> Status
And if its sql 2008 or below
DECLARE @CurrentMonthYear varchar(30)
SET @CurrentMonthYear = 'Feb-2013'
;With CTE
AS
SELECT *,
ROW_NUMBER() OVER (PARTITION BY IP,Port ORDER BY CAST('01-' + MonthYear AS datetime)) AS Seq
FROM Table
WHERE MonthYear = @CurrentMonthYear
)t
SELECT c1.*
FROM CTE c1
LEFT JOIN CTE c2
ON c2.IP = c1.IP
AND c2.Port = c1.Port
AND c2.Seq = c1.Seq - 1
WHERE c2.Status <> c1.Status
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