Fill the third variable according to date

Dear all,

In my database, visitdate and the variable pat_id is here. I want to fill the third variable one that went first, and then we V1, then V2, V3, V4 etc...
If the patient went to the same date and same type of visit must be here (e.g.P004)

type of visitdate pat_id
P001 23/03/2010 V1
27/05/2012 V3 P001
P001 07/27/2010 V2
P002 05/11/2010 V1
P002 05/09/2009 V3
P003 07/27/2010 V1
P004 23/03/2010 V1
P004 23/03/2010 V1
P004 07/27/2010 V2
P004 07/27/2011 V3

Thanks in advance for your help

Hello

This sounds like a job for the analytical DENSE_RANK function.

SELECT    pat_id
,       visitdate
,       'V' || TO_CHAR ( DENSE_RANK ()
                             OVER ( PARTITION BY  pat_id
                                 ORDER BY         visitdate
                        )
                )  AS type
FROM      table_x
ORDER BY  pat_id     -- statement ORDER BY clause is optional
,            visitdate
;

If you would care to post CREATE TABLE and INSERT instructions for the sample data, and then I could test it.
See the FAQ forum {message identifier: = 9360002}

Published by: Frank Kulash on 29 January 2013 09:19

Tags: Database

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