Question

我尝试使用内部联接创建过程。我一直听到以下错误：

Not unique table/alias: 'car'

我做错了什么？

我的程序

DELIMITER //   
CREATE PROCEDURE orderCreate(IN _LicenseNumber varchar(30), _Phonenumber varchar(20))
BEGIN    
INSERT INTO `order` (carID, clientID) 
Select car.id, client.id 
FROM car, client, owns   
INNER JOIN car 
ON car.id = owns.carID

INNER JOIN owns 
ON owns.clientID = client.id;

WHERE  car.licensenumber = _LicenseNumber 
AND client.phonenumber = _Phonenumber 
SELECT LAST_INSERT_ID(); 

END // 
DELIMITER ;

Answer 1

您正在同时使用INNER JOIN和笛卡尔积（MySQL ¹中的相同）：

FROM car, client, owns   
INNER JOIN car 
ON car.id = owns.carID

INNER JOIN owns 
ON owns.clientID = client.id;

只需从car声明中删除owns和FROM。

如果您想要两者，则必须为car和owns添加别名：

FROM car AS car1, clients, owns AS owns1

参考

http://dev.mysql.com/doc/refman/4.1/en/join.html

INNER JOIN和（逗号）在没有的情况下在语义上是等价的连接条件：两者之间产生笛卡尔积指定的表格

Answer 2

我认为你有很多桌子：尝试：

INSERT INTO `order` (carID, clientID) 
Select car.id, client.id 
FROM car    
INNER JOIN owns 
ON owns.clientID = client.id;
WHERE  car.licensenumber = _LicenseNumber 
AND client.phonenumber = _Phonenumber 
SELECT LAST_INSERT_ID();

内部联接＆＃34;不是唯一的表＆＃34;

2 个答案:

参考