Update the value for alternate recorded date

[Sathish_jammy]

Hi Experts,

Kindly go through my sample dataset for the clear picture.

data aaa;
input Id Vdate mmddyy10. visit;
format Vdate date9.;
cards;
12 10/11/2012 1
12 02/08/2013 2
12 01/09/2013 3
12 01/01/2014 4
63 05/06/2010 1
63 02/08/2010 2
63 07/11/2011 3
63 09/09/2011 4
;

data bbb;
input Id Rdate mmddyy10. BP;
format Rdate date9.;
cards;
12 10/11/2012 89
12 04/08/2013 56
12 05/09/2013 78
63 05/06/2010 45
63 06/08/2010 12
63 08/11/2011 32
63 09/09/2011 65
;

/*
OP
ID VDate    Visit	RDate	   BP
12 10/11/2012 1  	10/11/2012 89
12 02/08/2013 2		04/08/2013 56
12 01/09/2013 3		05/09/2013 78
12 01/01/2014 4		.			.
63 05/06/2010 1		05/06/2010 45
63 02/08/2010 2		06/08/2010 12
63 07/11/2011 3		08/11/2011 32
63 09/09/2011 4		09/09/2011 65
*/

I need to update the BP value through the matched date. 

I updated the step where VisitDate and RecordDate are the same.

But I failed to match the case where the RecordDate is > VisitDate. 

In those cases, I need to update the value of Rdate in between the Vdates. 

For reference, I placed the required OP.

Thanks in advance!

[PeterClemmensen]

In your request, all of your RecordDate is > VisitDate. What if that was not the case?

If your data is representative, you can simply do

data want;
   call missing(BP);
   merge aaa bbb;
   by ID;
run;

[Sathish_jammy]

Thanks for your quick and effective response.

I want to implement conditions like : 

Condition1 : Vdate = Rdate - (I done)

Condition 2: if Vdate < Rdate but that date in between its next Vdate ?????

I need to use these conditions as a SAS data step...

Sorry! if I trouble you...

I tried sql pattern as:

update ccc
set Rdate = b.Record_date,
BP = b.BloodPressure
FROM ccc a JOIN bbb b
ON a.ID = b.ID and
b.Rdate = a.Vdate

update ccc
set Rdate = b.Record_date,
BP = b.BloodPressure
FROM ccc a JOIN bbb b
ON a.ID = b.ID and Rdate is null and BP is null
b.Rdate between (the Vdate and nxt Vdate) ??????

I cant specify the date here Its differs for each IDs So Please suggest to specify this condition.Thanks in adv

[Astounding]

Instead of showing your program that didn't work, explain what result you would like to see and the reasoning that makes it the right result.