NOT IN query not working, SQL Server 2008

Question

The first part of the query before not in runs and gives me a list of

Answer 1

Purely stylistic: you can "squeeze out" the patientICD*tblICD product, and put it into a CTE, and reference that twice, like: (untested)

WITH zzz AS (
        SELECT pic.patientid , pic.admissiondate , pic.dischargedate
        , tab.ICD_ID , tab.descrip
        FROM patientICD pic
        JOIN tblICD tab ON pic.primarycode = tab.ICD_ID
        )
SELECT DISTINCT p.patientid
FROM  Patient p
JOIN zzz one ON one.patientid = p.patientid
             AND one.admissiondate = p.admissiondate 
             AND one.dischargedate = p.dischargedate 
WHERE one.descrip LIKE N'%diabetes%'
AND p.patientid NOT IN (
        SELECT two.patientid 
        FROM zzz two
        WHERE two.admissiondate = p.admissiondate
        AND two.dischargedate = p.dischargedate
        AND two.icd_id LIKE N'25000'
        );

NOTE: I don't like the LIKE N'25000'. I think an exact match would be fine. And the icd_id-field should be numeric, probably. And the {admissiondate,dischargedate} pair should be modelled out, too; possibly by using a diagnosis_id or incident_id.