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Message Posted: Wed, 27 Jun 2013 @ 00:38:59 GMT

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Jerry,

Without spending much time on this or knowing the table structure, I can only suggest looking at the Ordered Analytical Functions for a possible solution. Something like:

     (D_date - MAX(A_date) over (partition by patient order by A_date rows
     between 1 preceding and 1 preceding)

Regards,

Jim

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