Monster edit: Die Abfrage läuft jetzt, liefert aber falsche Antworten. Ein grobes Schema wurde hinzugefügt. PatientID ist nicht der Primärschlüssel in der Tabelle tblPatientVisits, weil dieselbe PatientID mehr als einmal vorhanden sein kann.
Jeder Bezirksname wird aufgeführt, aber jeder count(s.countyName) und count(t.countyname) als 1
PatientVisits
PatientID int
PatientState varchar(2)
patientCounty varchar(3)
visitNumber int - PK
tblStateCounties
CPK stateCode varchar(2)
CPK countyCode varchar(3)
countyName varchar(25)
SELECT t.countyName,
count(t.countyName) as reAdmits ,count(s.countyName) as totalVisits
FROM (
SELECT countyName,count(countyName) AS readmitCounts
FROM (
SELECT tblPatient.patientID
,tblStateCounties.countyName
FROM tblPatient
INNER JOIN tblPatientVisits
ON tblPatient.patientID = tblPatientVisits.patientID
INNER JOIN tblStateCounties
ON tblPatientVisits.patientState = tblStateCounties.stateCode
AND tblPatientVisits.patientCounty = tblStateCounties.countyCode
GROUP BY tblPatient.patientID
,tblStateCounties.stateCode
,tblStateCounties.countyName
HAVING (COUNT(tblPatient.patientID) > 1)
AND (tblStateCounties.stateCode = '21')
) t
GROUP BY countyname
) t
INNER JOIN (
SELECT countyName
FROM (
SELECT tblStateCounties.countyName
,COUNT(tblStateCounties.countyName) AS counts
FROM tblPatient
INNER JOIN tblPatientVisits
ON tblPatient.patientID = tblPatientVisits.patientID
INNER JOIN tblStateCounties
ON tblPatientVisits.patientState = tblStateCounties.stateCode
AND tblPatientVisits.patientCounty = tblStateCounties.countyCode
WHERE (tblStateCounties.stateCode = '21')
GROUP BY tblStateCounties.countyName
) z
) s
ON s.countyName = t.countyName
group by s.countyname, t.countyname
edit: Ich habe eine Abfrage, die jetzt läuft, aber sie gibt zurück