CREATE TRIGGER FOR INSERT, UPDATE, DELETE : Trigger for Delete « Trigger « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Trigger » Trigger for Delete 
22. 4. 4. CREATE TRIGGER FOR INSERT, UPDATE, DELETE
2CREATE TABLE Orders (
3>      OrderID int IDENTITY (11NOT NULL ,
4>      CustomerID nchar (5NULL ,
5>      EmployeeID int NULL ,
6>      OrderDate datetime NULL ,
7>      RequiredDate datetime NULL ,
8>      ShippedDate datetime NULL ,
9>      ShipVia int NULL ,
10>     Freight money NULL DEFAULT (0),
11>     ShipName nvarchar (40NULL ,
12>     ShipAddress nvarchar (60NULL ,
13>     ShipCity nvarchar (15NULL ,
14>     ShipRegion nvarchar (15NULL ,
15>     ShipPostalCode nvarchar (10NULL ,
16>     ShipCountry nvarchar (15NULL
17)
18> GO
1>    CREATE TRIGGER Order2DependsOnOrders
2>       ON Orders
3>       FOR INSERT, UPDATE, DELETE
4>    AS
5>       DECLARE @Count int
6>       SELECT @Count = COUNT(*FROM DELETED
7>       IF @Count > 0
8>       BEGIN
9>          IF NOT EXISTS
10>             (
11>              SELECT 'True'
12>              FROM Deleted d
13>              LEFT JOIN Orders o
14>                 ON d.OrderID = o.OrderID
15>              WHERE o.OrderID IS NULL
16>             )
17>          BEGIN
18>             RAISERROR('Record Exists In Orders Table. Delete Cancelled.',16,1)
19>             ROLLBACK TRAN
20>          END
21>       END
22>       IF @@ERROR != 0
23>          ROLLBACK TRAN
24>       SELECT @Count = COUNT(*FROM INSERTED
25>       SELECT 'Count is ' + CONVERT(varchar,@Count' Before Delete'
26>       IF @Count > 0
27>       BEGIN
28>          IF EXISTS
29>             (
30>              SELECT 'True'
31>              FROM Inserted i
32>              LEFT JOIN Orders o
33>                 ON i.OrderID = o.OrderID
34>              WHERE o.OrderID IS NULL
35>             )
36>          BEGIN
37>             RAISERROR('Inserted Record Must exist in the Orders Table',16,1)
38>             ROLLBACK TRAN
39>          END
40>       END
41>       IF @@ERROR != 0
42>          ROLLBACK TRAN
43>       GO
1>       drop TRIGGER Order2DependsOnOrders;
2>       GO
1>       drop table Orders;
2>       GO
22. 4. Trigger for Delete
22. 4. 1. CREATE TRIGGER FOR DELETE
22. 4. 2. Trigger for delete and deleted table
22. 4. 3. After its data has been deleted, the trigger deletes corresponding rows from the sales and discounts tables.
22. 4. 4. CREATE TRIGGER FOR INSERT, UPDATE, DELETE
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