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oasis1
Starting Member
35 Posts |
 Posted - 2012-01-30 : 21:04:03
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| I need to get the 2 records for a patient that are at least a year old. We qualify a quitter to be some one who has not smoked for over a year. I need to pull the 1st and 4th record in this case and calculate the datediff and mark them as Quitter. ID Appt Dates Status22 01-01-2012 former smoker 22 10-21-2011 former smoker22 05-10-2011 former smoker22 11-23-2010 former smoker22 08-20-2010 current smoker mahalo, for your help.... |
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visakh16
Very Important crosS Applying yaK Herder
52326 Posts |
Posted - 2012-01-31 : 00:09:26
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| [code]SELECT CASE WHEN t.Status = t1.Status AND t.Status = 'former smoker' THEN 'Quitter' ELSE 'Non quitter' ENDFROM (SELECT ROW_NUMBER() OVER (PARTITION BY ID ORDER BY Dates DESC) AS Rn,* FROM table) tCROSS APPLY (SELECT TOP 1 Status FROM table WHERE ID = t.ID AND Dates <= DATEADD(yy,-1,t.Dates) ORDER BY Dates DESC )t1WHERE t.Rn=1[/code]------------------------------------------------------------------------------------------------------SQL Server MVPhttp://visakhm.blogspot.com/ |
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Get two records at least year apart