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Steve Schudlo wrote:
> 
> SELECT accession_num FROM sample WHERE creation_data IN (SELECT
> MAX(creation_date) from SAMPLE GROUP BY patient_id)
 
Is this a typo?  You have creation_data on the left hand side of IN and
MAX(creation_date) on the right hand side.  Also, 'sample' and 'SAMPLE'
are different tables if IDB is case sensitive.

Toby.
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