I have a database table called Booking. There are 4 fields in it: booking_id, date, time, and doctor_id and booking_id is the primary key.
The doctor_id is the primary key of the Doctor table.
Now I am want to List out the booking record in the Booking table, and group by date, time and doctor_id together. It should count how many booking is happening for the same date, same time and same doctor_id.
The booking record have 3 items
I expect the output
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/* give feedback if any correction required*/ CREATE TABLE Doctor (doctor_id integer PRIMARY KEY, doctor_name varchar(20)); INSERT INTO Doctor  VALUES(1,'XYZ'); INSERT INTO Doctor  VALUES(2,'QWE'); INSERT INTO Doctor  VALUES(3,'RTY'); CREATE TABLE Booking (booking_id integer PRIMARY KEY, date Date,time Time,doctor_id integer, FOREIGN KEY (doctor_id) REFERENCES Doctor(doctor_id)); INSERT INTO Booking  VALUES(1,'2020-4-27','5:45',1); INSERT INTO Booking  VALUES(2,'2020-4-27','5:45',1); INSERT INTO Booking  VALUES(3,'2020-4-26','5:45',2); select date,time,Count(*) as waiting_number,Booking.doctor_id from Booking  INNER JOIN Doctor ON Booking.doctor_id = Doctor.doctor_id group by date, Booking.doctor_id,time Answer question ...