Sqlfiddle问题

Question

Create table customer
(CustomerID int(255) not null auto_increment,
FirstName varchar(255) not null,
LastName varchar(255) not null,
StreetAddress char(255) not null,
Apartment varchar(255) not null,
City varchar(255) not null,
State varchar(2) not null,
ZipCode int(9) not null,
HomePhone int(10) not null,
MobilePhone int(10) not null,
OtherPhone int(10) not null,
Primary Key (CustomerID));
insert into Customer 
(FirstName, LastName, StreetAddress, Apartment, City, State,
ZipCode, HomePhone, MobilePhone, OtherPhone)
Values ("Ken", "Weger", "StreetAddress", "Apartment", "City", 
"ST", 123456789, 1111111111, 222222222, 333333333);

Create Table Doughnut
(DoughnutID int(255) not null auto_increment,
Name varchar(255) not null,
Description varchar(255) not null,
UnitPrice decimal(3,2) not null,
Primary Key (DoughnutID));
insert into Doughnut (Name, Description, UnitPrice)
Values ("Plain", "Plain Donut", "1.50"),
("Glazed", "Glazed Donut", "1.75"),
("Cinnamon", "Cinnamon Donut", "1.75"),
("Chocolate", "Chocolate Donut", "1.75"),
("Sprinkle", "Sprinkle Donut", "1.75"),
("Gluten-Free", "Gluten-Free Donut", "2.00");

Create Table DoughnutOrder
(DoughnutOrderID int(255) not null auto_increment,
DoughnutID int(255),
Quantity int(255),
Primary Key (DoughnutOrderID),
Index Doughnut(doughnutid),
Foreign Key (DoughnutID) References Doughnut(DoughnutID));
Insert into Doughnutorder (DoughnutId, Quantity)
values ((select DoughnutId from Doughnut where doughnutid = 1), 1),
      ((select DoughnutId from Doughnut where doughnutid = 2), 5),
      ((select DoughnutId from Doughnut where doughnutid = 3), 12),
       ((select DoughnutId from Doughnut where doughnutid = 4), 3),
       ((select DoughnutId from Doughnut where doughnutid = 5), 4),
        ((select DoughnutId from Doughnut where doughnutid =6), 5);

Create Table Sales
(ORDERID int(255) not null Auto-increment,
CustomerID int(255) not null,
DoughnutOrderID int(255) not null,
`Date` date not null,
SpecialHandlingInstructions varchar(255),
Primary Key (ORDERID),
Index Customer (customerID),
Foreign Key (customerid) References customer(customerid),
Index doughnutorder (doughnutorderid),
Foreign Key (doughnutorderid) references doughnutorder(doughnutorderid);

 Insert into Sales (Customerid, DoughnutorderID, `date`, SpecialHandlingInstructions)
Values ((select customerid from customer), (select DoughnutOrderID from DoughnutOrder), 20151104, Please Include plates and napkins);

我正在使用sqlfiddle。它告诉我模式已经准备好了，但是每次我执行简单的

Select * from Sales;

我得到的响应表sales不存在。有什么想法可以解释原因吗？我之所以在这个网站上这样做，是因为我的学校希望我在这个网站上截取屏幕截图，以展示代码的工作。

Answer 1

模式

Create table customer
(
CustomerID int(255) not null AUTO_INCREMENT,
FirstName varchar(255) not null,
LastName varchar(255) not null,
StreetAddress char(255) not null,
Apartment varchar(255) not null,
City varchar(255) not null,
State varchar(2) not null,
ZipCode int(9) not null,
HomePhone int(10) not null,
MobilePhone int(10) not null,
OtherPhone int(10) not null,
Primary Key (CustomerID)
);

insert into Customer 
(FirstName, LastName, StreetAddress, Apartment, City, State,
ZipCode, HomePhone, MobilePhone, OtherPhone)
Values ("Ken", "Weger", "StreetAddress", "Apartment", "City", 
"ST", 123456789, 1111111111, 222222222, 333333333);

Create Table Doughnut
(DoughnutID int(255) not null AUTO_INCREMENT,
Name varchar(255) not null,
Description varchar(255) not null,
UnitPrice decimal(3,2) not null,
Primary Key (DoughnutID)
);

insert into Doughnut (Name, Description, UnitPrice)
Values ("Plain", "Plain Donut", "1.50"),
("Glazed", "Glazed Donut", "1.75"),
("Cinnamon", "Cinnamon Donut", "1.75"),
("Chocolate", "Chocolate Donut", "1.75"),
("Sprinkle", "Sprinkle Donut", "1.75"),
("Gluten-Free", "Gluten-Free Donut", "2.00");


Create Table DoughnutOrder
(DoughnutOrderID int(255) not null AUTO_INCREMENT,
DoughnutID int(255),
Quantity int(255),
Primary Key (DoughnutOrderID),
Index Doughnut(doughnutid),
Foreign Key (DoughnutID) References Doughnut(DoughnutID));

Insert into Doughnutorder (DoughnutId, Quantity)
values (1, 1),
(2, 5),
(3, 12),
(4, 3),
(5, 4),
(6, 5);

Create Table Sales
(
ORDERID int(255) not null AUTO_INCREMENT,
CustomerID int(255) not null,
DoughnutOrderID int(255) not null,
`Date` date not null,
SpecialHandlingInstructions varchar(255),
Primary Key (ORDERID),
Index Customer (customerID),
Foreign Key (customerid) References customer(customerid),
Index doughnutorder (doughnutorderid),
Foreign Key (doughnutorderid) references doughnutorder(doughnutorderid)
);


Insert into Sales (Customerid, DoughnutorderID, `date`, SpecialHandlingInstructions)
Values (1, 1, 20151104, 'Please Include plates and napkins');

SQL语句

Select * from Sales;

结果

+-------+----------+---------------+--------------------------+----------------------------------------------+
|ORDERID|CustomerID|DoughnutOrderID|Date                      |SpecialHandlingInstructions                   |
--------------------------------------------------------------------------------------------------------------
|1      |1         |1              |November, 04 2015 00:00:00|Please Include plates and napkins