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Microsoft, SQL, 2005, Update Script Help Needed

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Last Modified: 2012-05-05
Experts,

I have a field in my PatientProfile table  - 'ReleaseOfInformationIndicatorDate' I wish to update. The only twist is I want to set this date equal to the patients last visit. That table is Patientvisit. How can I tell my update script to give me the date of last visit in this field right? If no visit, leave Null.
update PatientProfile
inner join patientvisit pv on pp.PatientProfileId = pv.PatientProfileId
Set ReleaseOfInformationIndicatorDate = max(pv.visit)

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