How to compare and use only time from datetime format in sql? My insertion is given in datetime format

Question

Please note that this is not my full code for the query. I just need to understand how to compare the time only. Here is my table creation code

CREATE TABLE IF NOT EXISTS `mydb`.`ActivityBooking` (
  `ActivityTime` datetime  NOT NULL,
  `NumPeople` INT NULL,
  `ActivityID` VARCHAR(45) NOT NULL,
  `GuideID` VARCHAR(10) NOT NULL,
  `Reservation_ReservationID` VARCHAR(10) NOT NULL,
  PRIMARY KEY (`ActivityTime`, `ActivityID`),
  INDEX `fk_ActivityBooking_Activity1_idx` (`ActivityID` ASC) VISIBLE,
  INDEX `fk_ActivityBooking_Staff1_idx` (`GuideID` ASC) VISIBLE,
  INDEX `fk_ActivityBooking_Reservation1_idx` (`Reservation_ReservationID` ASC) VISIBLE,
  CONSTRAINT `fk_ActivityBooking_Activity1`
    FOREIGN KEY (`ActivityID`)
    REFERENCES `mydb`.`Activity` (`ActivityID`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_ActivityBooking_Staff1`
    FOREIGN KEY (`GuideID`)
    REFERENCES `mydb`.`Staff` (`StaffID`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_ActivityBooking_Reservation1`
    FOREIGN KEY (`Reservation_ReservationID`)
    REFERENCES `mydb`.`Reservation` (`ReservationID`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION);

Table insertion

Insert into activitybooking values('2020-10-7 15:17:00',6,'C01','S5','R321');
Insert into activitybooking values('2020-12-8 16:15:00',7,'D01','S2','R321');
Insert into activitybooking values('2020-11-9 18:12:00',2,'E01','R321','S4');

Currently I am stuck because I want to display results for bookings made after mid-day and before 4pm. But I don't know how to just compare the time from the datetime format. I am not adding the codes for the other tables in order to keep the information here minimum. But if needed I can provide.

select customerfname, customerlname, activityname
from customer, activitybooking,activity
where activity.activityid = activitybooking.activityid
and activitytime between time('12-0-0') and time('16-0-0');

Answer 1

What you need to do is apply the TIME function to your activitytime column and then compare it to 12:00:00 and 16:00:00 :

TIME(activitytime) BETWEEN '12:00:00' AND '16:00:00'

Note if you don't want to include 16:00:00 replace that with 15:59:59 . Also, if you write the time strings in HH:mm:ss format then you don't need to apply TIME to them and can just compare directly.