我正試圖建立一個博士 - 病人預約系統。到目前爲止,我有四個表: - Patient:- Doctor:- Appointment:- Availability:-
patientID doctorName time time
name room date doctorName
address patientID
下面的查詢僅空閒時隙顯示所有的空閒時間插槽,還沒有被訂了具體: - SELECT DISTINCT tbl_available.timeslot
FROM tbl_appointment RIGHT JOIN
tbl_available ON (tbl_appointment.employeeID = tbl_available.employeeID) AND (tbl_a