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Message Posted: Wed, 02 Sep 2009 @ 18:58:46 GMT

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Hi,

Thanks for the reply. Another question for you. How do I pass the patient id to the derived tables? The query below does not work because p.patient_id cannot be seen in those derived tables.

     Select
       P.patient_name
     , P.Patient_age
     , P.Patient_weight
     , A.CountWarfarin
     , B.CountHeprin
     FROM patient P
     , (Select Count(*) AS CountWarfarin from drug_taken WHERE drug_name='Warfarin'
     patient_id=p.patient_id)  A
     , (Select Count(*) AS CountHeprin from drug_taken WHERE drug_name='Heprin' patient_id=
     p.patient_id) B

Thank you,

-Tesh

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