Question

I am trying to create a query which returns from my database the available vehicles based on the from and to dates a user inputs.

This is currently the date within my booking table.

Booking Table
booking_id     customer_id    reg_number    date_from    date_to    status
1              2              RH34 TJT      23-JAN-13    24-JAN-13  1
2              3              RJ54 FKF      26-JAN-13    26-JAN-13  1     

Below is my query, it works if i put a date that is not equal to a date which is already in the booking table. For example if i put the 22-JAN-13 to 27-JAN-13 those two cars in the above table will be omitted from the results cause they are booked. However if I put in 23-JAN-13 to 24-JAN-13, the car booked on this day will also be returned when it shouldn’t be because its booked.

SELECT   *
FROM vehicles
INNER JOIN car_model ON vehicles.model_code = car_model.model_code
INNER JOIN manufacture ON car_model.manufacture_code = manufacture.manufacture_code
LEFT OUTER JOIN booking ON vehicles.reg_number = booking.reg_number
WHERE ((booking.date_from <= '23-JAN-13' OR booking.date_from >= '24-JAN-13')
        AND (booking.date_to <= '23-JAN-13' OR booking.date_to >= '24-JAN-13')
        AND booking.booking_status = 1);

Because i am using <= and >= the equals part will cause it to omit them as they are equal, or am i wrong?

Answer 1

try this

SELECT   *
FROM vehicles
INNER JOIN car_model ON vehicles.model_code = car_model.model_code
INNER JOIN manufacture ON car_model.manufacture_code = manufacture.manufacture_code
LEFT OUTER JOIN booking ON vehicles.reg_number = booking.reg_number
WHERE ((booking.date_from < '23-JAN-13' OR booking.date_from > '24-JAN-13')
        AND (booking.date_to < '23-JAN-13' OR booking.date_to > '24-JAN-13')
        AND booking.booking_status = 1);