我试图编写一个查询来显示每个乘客的名字与他们的票价。 这里是我到目前为止什么 - 它给没有错误,也没有任何结果:无法连接表
-- Write a query to display the Name of each passenger as well as the fare for their trip.
select passenger.name, departure_info.fare * passenger.quantity AS passenger_fare
from passenger, seat_passenger, manages, departure_info, seat_info
where departure_info.Dept_id=manages.Dept_id
AND manages.Seat_id=seat_info.Seat_id
AND seat_info.Seat_id=seat_passenger.Seat_id
AND seat_passenger.Pass_id=passenger.pass_id
下面是使用正确的联接语法,会使这个查询从您的查询的表http://i.imgur.com/R4EFthY.png
考虑使用隐式连接和通过一次加入一个表,以确保启动连接正确 –
检查您的表是否没有记录。 –