I have two tables:
1. Readmission
The readmission table contains readmission visits with columns Readmit_PatientID, Readmit_VisitID, Readmit_AdmitDateTime, PrevAdmit_VisitID, PrevAdmit_DischargeDateTime.
Readmit_VisitID is unique in the Readmission table.
2. All_Visits
The All Visits table contains all the visits with columns Patient_ID, VisitServiceDateTime, VisitID.
VisitID is unique in the All_Visits table.
The two tables are joined by Readmission.Prev_VisitID and AllVisits.VisitID
I need to find the number of Visits between the PrevAdmit_DischargeDateTime and Readmit_AdmitDateTime.
