錯誤代碼：1054未知列「s.Product_id」在「上clause'Error代碼：1054未知列‘s.Product_id’在‘關於條款’

Question

我有一個錯誤在MySQL：Error Code: 1054. Unknown column 's.Product_id' in 'on clause'

它出現在：

SELECT c.customer_ID, p.Product_id, p.Product_price, s.Items_quantity, (p.Product_price * s.Items_quantity) AS total FROM Products p LEFT JOIN Shopping_list s ON p.Product_id = s.Product_id LEFT JOIN Customer_sign_in c ON c.customer_ID = s.customer_ID LIMIT 0, 50000 

有沒有人有一個想法爲什麼會發生？

Answer 1

您應該使用LEFT JOIN

select c.customer_ID, p.Product_id, p.Product_price, s.Items_quantity, 
    (p.Product_price * s.Items_quantity) as total from Products p LEFT JOIN Shopping_list s ON p.Product_id = s.Product_id LEFT JOIN Customer_sign_in c ON c.customer_ID = s.customer_ID; 

Answer 2

你確定你有表Shopping_list和命名它Product_id列？

如果您沒有它，請創建該列並重試。

Answer 3

drop database if exists shopmeout; 
create database shopmeout; 
use shopmeout; 
drop table if exists Customer_sign_in; 

CREATE TABLE Customer_sign_in (
    customer_ID INT (50) not null, 
    Name_customer varchar(255) not null, 
    Credit_card BIGINT(100) not null, 
    Password_cust TEXT(150) not null, 
    Email_cust TEXT(50) not null, 
    primary key (customer_ID) 
); 
insert into Customer_sign_in values(19867889, 'Stefan Darescu', 9018783269173917, 'personalcomputer84', 'stefandarescu@gmail.com'); 
insert into Customer_sign_in values(11958178, 'Mogens Hemming', 5090180120973782,'masadebiliard4', 'mogenshemming@yahoo.com'); 
insert into Customer_sign_in values(52562523, 'Viggo Kristian', 9015908218093698,'asawece', 'viggokristian@gmail.com'); 
insert into Customer_sign_in values(42515323, 'Asbjørn Hjalmar', 0198490128761903,'esrjgads', 'asbjornhjalmar@hotmail.com'); 
insert into Customer_sign_in values(69723642, 'Rasmus Bjarne', 9180583647839793,'Sgsyhdfs', 'rasmusbjarne@outlook.com'); 

CREATE TABLE Products (
    Product_id INT(150) not null, 
    Product_name VARCHAR(100) not null, 
    Product_price DECIMAL(6,2) not null, 
    Deduction_price INT(50) not null, 
    Deadline DATE not null, 
    PRIMARY KEY (Product_id) 
); 
insert into Products values(509687, 'Plain Flower', 59.46, 10, '2013-05-30'); 
insert into Products values(485901, 'Cow Milk', 17.85, 12, '2013-04-18'); 
insert into Products values(908571, 'Kærgården', 131.75, 8, '2013-04-07'); 
insert into Products values(432612, 'Chicken Eggs', 27.57, 9, '2013-03-31'); 
insert into Products values(853235, 'Pepsi Cherry', 25.11, 12, '2013-03-25'); 
insert into Products values(357342, 'Spaghetti', 10.8, 5, '2013-03-20'); 
insert into Products values(123563, 'Spaghetti sos', 22.4, 10, '2013-03-17'); 

delimiter // 
CREATE TRIGGER first_trigger BEFORE UPDATE ON Products 
FOR EACH ROW 
BEGIN 
IF NEW.Product_price < 20 THEN 
SET NEW.Product_price = 15; 
ELSEIF NEW.Product_price > 140 THEN 
SET NEW.Product_price = 80; 
END IF; 
END;// 
delimiter ; 
UPDATE Products set Product_price = 25 where Product_id = 509687; 
UPDATE Products set Product_price = 22 where Product_id = 908571; 

CREATE TABLE Recipes (
    Recipes_id INT (10) not null, 
    Recipe_name CHAR (150) not null, 
    Recipe_descrip TEXT(255) not null, 
    primary key (Recipes_id) 
); 
insert into Recipes values(513678, 'Pancakes', 'Crack the eggs into a blender, add the flour, milk and a pinch of sea salt, and blitz until smooth.'); 
insert into Recipes values(867523, 'Spaghetti Bolognese', 'Heat the oil in a large, heavy-based saucepan and fry the bacon until golden over a medium heat.'); 

CREATE TABLE Shopping_list (
    Shopping_list_id INT (50) not null, 
    customer_ID INT (50) not null, 
    Items_quantity INT (50) not null, 
    primary key (Shopping_list_id), 
    foreign key (customer_ID) 
     REFERENCES 
    Customer_sign_in (customer_ID) 
); 
insert into Shopping_list values(14081869, 19867889, 15); 
insert into Shopping_list values(15163266, 11958178, 30); 
insert into Shopping_list values(34232325, 52562523, 3); 
insert into Shopping_list values(82412845, 42515323, 7); 
insert into Shopping_list values(36272236, 69723642, 5); 

CREATE TABLE Payment (
    Payment_id INT(150) NOT NULL, 
    customer_ID INT(150) NOT NULL, 
    Date_pay DATETIME NOT NULL, 
    Shopping_list_id INT(50) NOT NULL, 
    PRIMARY KEY (Payment_id), 
    FOREIGN KEY (customer_ID) 
     REFERENCES Customer_sign_in (customer_ID), 
    FOREIGN KEY (Shopping_list_id) 
     REFERENCES Shopping_list (Shopping_list_id) 
); 
insert into Payment values(84163801, 19867889, '2013-05-25 07:12:00', 14081869); 
insert into Payment values(89171750, 11958178, '2013-04-08 21:43:12', 15163266); 
insert into Payment values(19829247, 52562523, '2013-04-02 16:41:09', 34232325); 
insert into Payment values(35819204, 42515323, '2013-03-25 23:54:32', 82412845); 
insert into Payment values(25085739, 69723642, '2013-03-20 12:38:56', 36272236); 

CREATE TABLE Has (
    Product_id INT(150) NOT NULL, 
    Recipes_id INT(150) NOT NULL, 
    FOREIGN KEY (Product_id) 
     REFERENCES Products (Product_id), 
    FOREIGN KEY (Recipes_id) 
     REFERENCES Recipes (Recipes_id) 
); 
insert into Has values(509687, 513678); 
insert into Has values(485901, 513678); 
insert into Has values(908571, 513678); 
insert into Has values(357342, 867523); 
insert into Has values(123563, 867523); 

CREATE TABLE Goes (
    Product_id INT(150) NOT NULL, 
    Shopping_list_id INT(150) NOT NULL, 
    FOREIGN KEY (Product_id) 
     REFERENCES Products (Product_id), 
    FOREIGN KEY (Shopping_list_id) 
     REFERENCES Shopping_list (Shopping_list_id) 
); 
insert into Goes values(485901, 14081869); 
insert into Goes values(123563, 14081869); 
insert into Goes values(908571, 14081869); 
insert into Goes values(485901, 82412845); 
insert into Goes values(123563, 34232325); 
insert into Goes values(357342, 34232325); 

select * from Shopping_list; 
select * from Payment; 
select * from Customer_sign_in; 
select * from Recipes; 
select * from Products; 
select * from Has; 
select * from Goes; 

SELECT c.customer_ID, p.Product_id, p.Product_price, s.Items_quantity, 
(p.Product_price * s.Items_quantity) AS total FROM Products p LEFT JOIN Shopping_list s ON p.Product_id = s.Product_id LEFT JOIN Customer_sign_in c ON c.customer_ID = s.customer_ID;