Cascading Updates and Deletes : Foreign Key « Constraints « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Constraints » Foreign Key 
7. 3. 8. Cascading Updates and Deletes
6CREATE TABLE Orders (
7>      OrderID int primary key ,
8>      CustomerID nchar (5NULL ,
9>      EmployeeID int NULL ,
10>     OrderDate datetime NULL ,
11>     RequiredDate datetime NULL ,
12>     ShippedDate datetime NULL ,
13>     ShipVia int NULL ,
14>     Freight money NULL DEFAULT (0),
15>     ShipName nvarchar (40NULL ,
16>     ShipAddress nvarchar (60NULL ,
17>     ShipCity nvarchar (15NULL ,
18>     ShipRegion nvarchar (15NULL ,
19>     ShipPostalCode nvarchar (10NULL ,
20>     ShipCountry nvarchar (15NULL
21)
22> GO
1>
2>
3>
4>    CREATE TABLE OrderDetails
5>    (
6>       OrderID      int           NOT NULL,
7>       PartNo       varchar(10)   NOT NULL,
8>       Description  varchar(25)   NOT NULL,
9>       UnitPrice    money         NOT NULL,
10>       Qty          int           NOT NULL,
11>       CONSTRAINT    PKOrderDetails
12>          PRIMARY KEY   (OrderID, PartNo),
13>       CONSTRAINT    FKOrderContainsDetails
14>          FOREIGN KEY   (OrderID)
15>             REFERENCES Orders(OrderID)
16>             ON UPDATE  NO ACTION
17>             ON DELETE  CASCADE
18>    )
19> GO
1>
2> drop table OrderDetails;
3> drop table Orders;
4> GO
7. 3. Foreign Key
7. 3. 1. The FOREIGN KEY Clause
7. 3. 2. FOREIGN KEY Constraints
7. 3. 3. A statement that adds a foreign key constraint
7. 3. 4. ON DELETE and ON UPDATE Options
7. 3. 5. Adding a FOREIGN KEY to the Employees Table
7. 3. 6. Re-creating the FOREIGN KEY with NO ACTION (Implicitly)
7. 3. 7. Referential Constraints
7. 3. 8. Cascading Updates and Deletes
7. 3. 9. Supporting Basic Referential Integrity with Foreign Keys
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