SQL Editor
SQL Foreign Key Example
Tables and Columns
Customer
- Id
(int)
- FirstName
(nvarchar)
- LastName
(nvarchar)
- City
(nvarchar)
- Country
(nvarchar)
- Phone
(nvarchar)
Order
- Id
(int)
- OrderDate
(datetime)
- OrderNumber
(nvarchar)
- CustomerId
(int)
- TotalAmount
(decimal)
OrderItem
- Id
(int)
- OrderId
(int)
- ProductId
(int)
- UnitPrice
(decimal)
- Quantity
(int)
Product
- Id
(int)
- ProductName
(nvarchar)
- SupplierId
(int)
- UnitPrice
(decimal)
- Package
(nvarchar)
- IsDiscontinued
(bit)
Supplier
- Id
(int)
- CompanyName
(nvarchar)
- ContactName
(nvarchar)
- ContactTitle
(nvarchar)
- City
(nvarchar)
- Country
(nvarchar)
- Phone
(nvarchar)
- Fax
(nvarchar)
Task:
Create an Order table with a foreign key referencing the Customer table.
Click here
for details on
Foreign Key
.
CREATE TABLE [Order] ( Id INT IDENTITY, OrderDate DATETIME2 NOT NULL DEFAULT GETDATE(), OrderNumber NVARCHAR(10) NULL, CustomerId INT REFERENCES Customer(Id) NOT NULL, TotalAmount DECIMAL(12,2) NULL DEFAULT 0, CONSTRAINT PK_Order PRIMARY KEY (Id) )
Command ran successfully
Note
: the changes were rolled back (undone)
to maintain the integrity of the database.
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