Posted by Stu on 11/09/93 11:26

this table confuses me:

Table: Specialties (provides many-to-many relationshop between Doctors,
Groups, and Specialties)
-----------------
SpecialtyID
SpecialtyDesc
DoctorID
GroupID

Are you saying that a doctor can only specialize in something within
the context of a certain group? In other words Dr.Smith is a pediatric
oncologist, but can only work in pediatrics for Group A and oncology
for group B? Does that happen?

It would be easier if a Group was a collection of doctors who all had
specialties.

SELECT d.DoctorName
FROM Doctors d JOIN Docs2Groups d2g on d.DoctorID = d2g.DoctorID
JOIN Specialties s ON d.DoctorID = s.DoctorID
JOIN Facilities f ON f.GroupID = d2g.GroupID
WHERE s.SpecialityDesc = 'cardiology'
AND f.City = 'Reno' AND f.State = 'NV'

But, if a Doctor can only specialize in something in the context of a
group, then you could do this:

SELECT d.DoctorName
FROM Doctors d JOIN Docs2Groups d2g on d.DoctorID = d2g.DoctorID
JOIN Specialties s ON d2g.DoctorID = s.DoctorID
AND d2g.GroupID = s.GroupID
JOIN Facilities f ON f.GroupID = d2g.GroupID
WHERE s.SpecialityDesc = 'cardiology'
AND f.City = 'Reno' AND f.State = 'NV'

Untested.

HTH,
Stu

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