在字段列表中的db **'RentalDate‘中创建视图事件是不明确的**

Question

字段列表中的“RentalDate”是不明确的

drop view if exists event;
create view event as
select concat(customer.firstname, " ", customer.surname) as title, 
Concat(DATE_FORMAT(RentalDate,'%Y-%m-%d'), "T", StartTime) as start, 
concat("Equipmentitem: " ,equipmentitem.id) as equipment,rental.id as id
from customer, equipmentitem, rental
where customer.ID = rental.CustomerID and equipmentitem.id=rental.EquipmentID;

这是db中的表。

Create Table Rental
(
    RentalID    integer,
    RentalDate  Datetime,
    ReturnDate  Datetime,
    RentalInvoice Integer,
    Primary Key(RentalID),
    Foreign Key(CustomerID) references Customer(CustomerID),
    Foreign Key(DeliveryID) references Delivery(DeliveryID),

);

Insert into Rental(RentalID, RentalDate, ReturnDate,  RentalInvoice,) values(1,'2018-3-8','2019-3-8','3');
Insert into Rental(RentalID, RentalDate, ReturnDate,  RentalInvoice,) values(2,'2017-3-8','2018-3-8','4');
Insert into Rental(RentalID, RentalDate, ReturnDate,  RentalInvoice,) values(3,'2018-1-6','2019-2-6','5');
Insert into Rental(RentalID, RentalDate, ReturnDate,  RentalInvoice,) values(4,'2018-4-10','2018-3-12','6');
Insert into Rental(RentalID, RentalDate, ReturnDate,  RentalInvoice,) values(5,'2018-2-7','2019-3-11','8');
Insert into Rental(RentalID, RentalDate, ReturnDate,  RentalInvoice,) values(6,'2018-3-8','2019-3-9','7');

Answer 1

这意味着“RentalDate”对于不同的表是常见的

试一试

Concat(DATE_FORMAT(<nameOfTable>.RentalDate,'%Y-%m-%d'), "T", <nameOfTable>.StartTime) as start