Need results returned based on prior records

I have a query that returns a list of patients including a discharge date, admit date, account number and drg.  It currently lists all patients.  The unique identifier to the patient is the unit number.  The account number is different every time they come in.  I need to know for each patient - if the admitdate is within 30 days of the last disdate and only if the drg was the same for both account numbers.  The query below is very basic - only showing the fields and their tables. I have no idea how to do this....  I've attached some sample data and shaded in the ones that would need to be returned from the query.  
Basically we are trying to find out which patients came back within 30 days for the same thing.

I am writing this report in Visual Studio with SQL Server 2005
Thanks!
SELECT  AbsPatDischarges.DisDate, AbsPat.UnitNumber, AbsPat.AccountNumber, AbsPatDrgData.Drg, AbsPat.PtStatus, AdmPatientFile.AdmitDate
FROM     AbsPat INNER JOIN
               AbsPatDischarges ON AbsPat.UrnABSPAT = AbsPatDischarges.UrnABSPAT INNER JOIN
               AbsPatDrgData ON AbsPatDischarges.UrnABSPAT = AbsPatDrgData.UrnABSPAT INNER JOIN
               AdmPatientFile ON AdmPatientFile.UrnADMPAT = AbsPat.AdmUrn
WHERE  (AbsPat.PtStatus LIKE 'in')
ORDER BY AbsPat.UnitNumber, AbsPatDischarges.DisDate

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30DAY-SAMPLE-DATA.xls
palmer9Asked:
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Mark WillsTopic AdvisorCommented:
Might be a group by type problem where you need to check where count(*) is > 1 as a subquery - or maybe an inline query where date is within 30 days...

So, need to be looking at rows where account numbers are same, drg are same, and dates within that 30 day requirement.

Hmmmm....

Maybe as simple as


SELECT  AbsPatDischarges.DisDate, AbsPat.UnitNumber, AbsPat.AccountNumber, AbsPatDrgData.Drg, AbsPat.PtStatus, AdmPatientFile.AdmitDate
FROM     AbsPat INNER JOIN
               AbsPatDischarges ON AbsPat.UrnABSPAT = AbsPatDischarges.UrnABSPAT INNER JOIN
               AbsPatDrgData ON AbsPatDischarges.UrnABSPAT = AbsPatDrgData.UrnABSPAT INNER JOIN
               AdmPatientFile ON AdmPatientFile.UrnADMPAT = AbsPat.AdmUrn
WHERE  (AbsPat.PtStatus LIKE 'in')
AND EXISTS ( select NULL from FROM     AbsPat  AP
               INNER JOIN AbsPatDischarges APD ON AP.UrnABSPAT = APD.UrnABSPAT
               INNER JOIN AbsPatDrgData APDD ON APD.UrnABSPAT = APDD.UrnABSPAT
               INNER JOIN AdmPatientFile APF ON APF.UrnADMPAT = AP.AdmUrn
               WHERE ApsPat.AccountNumber = AP.AccountNumber
               and AbsPatDrgData.Drg = APDD.Drg
               and AdmPatientFile.AdmitDate < APD.DisDate + 30)

ORDER BY AbsPat.UnitNumber, AbsPatDischarges.DisDate



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Mark WillsTopic AdvisorCommented:
Instead of :

 and AdmPatientFile.AdmitDate < APD.DisDate + 30)

Use :

 and AdmPatientFile.AdmitDate between APD.DisDate and APD.DisDate + 30)
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Mark WillsTopic AdvisorCommented:
One more time...



SELECT AbsPatDischarges.DisDate, AbsPat.UnitNumber, AbsPat.AccountNumber, AbsPatDrgData.Drg, AbsPat.PtStatus, AdmPatientFile.AdmitDate
FROM AbsPat INNER JOIN
AbsPatDischarges ON AbsPat.UrnABSPAT = AbsPatDischarges.UrnABSPAT INNER JOIN
AbsPatDrgData ON AbsPatDischarges.UrnABSPAT = AbsPatDrgData.UrnABSPAT INNER JOIN
AdmPatientFile ON AdmPatientFile.UrnADMPAT = AbsPat.AdmUrn
WHERE (AbsPat.PtStatus LIKE 'in')
AND EXISTS ( select NULL from FROM AbsPat AP
                          INNER JOIN AbsPatDischarges APD ON AP.UrnABSPAT = APD.UrnABSPAT
                          INNER JOIN AbsPatDrgData APDD ON APD.UrnABSPAT = APDD.UrnABSPAT
                          INNER JOIN AdmPatientFile APF ON APF.UrnADMPAT = AP.AdmUrn
                          WHERE ApsPat.UnitNumber = AP.UnitNumber
                          and AbsPatDrgData.Drg = APDD.Drg
                          and AbsPatDischarges.DisDate <> APD.disdate
                          and ApsPat.AccountNumber <> AP.AccountNumber -- Think this differentiates the two visits
                          and AdmPatientFile.AdmitDate between APD.DisDate and APD.DisDate + 30)

ORDER BY AbsPat.UnitNumber, AbsPatDischarges.DisDate

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palmer9Author Commented:
Perfect - Thank you so much!!!
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Mark WillsTopic AdvisorCommented:
A pleasure - happy to help :)
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