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[Referencing OLD AS O New AS N]: This statement allows us to refer Values (Old and New) for Data Manipulation language (DML) statements such as Delete, Insert or Update.
This statement is optional and is useful for referring the new and old values of the data that needs to be changed.
Syntax Create or Replace Trigger Trigger_Name Before or After or Instead of Insert or Update or Delete of Column_Name on Table_Name [Referencing OLD AS O New AS N] For Each Row When (Condition) Declare Declaration Section Begin Execution Section End; Create or Replace Trigger Trigger_Name: This statement creates a trigger with the given name or overwrites an existing trigger with the same name.
Before or After or Instead of: This statement specifies the time at which the trigger should be executed i.e., either before or after updating/Inserting/deleting the values in a table.
We can also have different messages to be displayed, basing on the events. Add Evidence ( @Case ID int , @Evidence ID int OUTPUT ) AS BEGIN SET NOCOUNT ON; DECLARE @Max Evidences TABLE ( Max Evidence Num int NOT NULL ); SET @Evidence ID = NULL; UPDATE dbo. Add Case ( @Case ID int OUTPUT ) AS BEGIN SET NOCOUNT ON; DECLARE @Cases TABLE ( Case ID int NOT NULL ); INSERT INTO dbo. Case ID INTO @Cases (Case ID) DEFAULT VALUES; SELECT @Case ID = Case ID FROM @Cases; END GO CREATE PROCEDURE dbo.So I need to create a trigger that creates a new evidence number for each case. Use a separate key table to store the last used evidence number for each case. Drop the objects from tempdb if they already exist, so we can modify the code as required. Evidence Keys (Case ID, Max Evidence Num) VALUES (@Case ID, 1); SET @Evidence ID = 1; END INSERT INTO dbo.For instance, case #1 can have evidence #'s 1,2,3,4 and so on. So I have a "Case" table (Case ID as PK) and a "Evidence" Table (Evidence Num as PK and Case ID as FK and associated attributes) So everytime I search for a specific case ID, I want a new "Evidence ID" column to populate. Evidence (Case ID, Evidence Num) VALUES (@Case ID, @Evidence ID); END; GO DECLARE @Case ID int; DECLARE @Evidence ID int; EXEC dbo. Add Evidence @Case ID, @Evidence ID OUT; SELECT @Evidence ID; EXEC dbo.Add Evidence @Case ID, @Evidence ID OUT; SELECT @Evidence ID; ╔════════╦════════════╦════════╦═════════════╗ ║ Case ID ║ Evidence ID ║ Case ID ║ Evidence Num ║ ╠════════╬════════════╬════════╬═════════════╣ ║ 1 ║ 1 ║ 1 ║ 1 ║ ║ 1 ║ 2 ║ 1 ║ 2 ║ ║ 1 ║ 3 ║ 1 ║ 3 ║ ║ 2 ║ 4 ║ 2 ║ 1 ║ ║ 2 ║ 5 ║ 2 ║ 2 ║ ║ 2 ║ 6 ║ 2 ║ 3 ║ ╚════════╩════════════╩════════╩═════════════╝ table, occurs in a single atomic statement, the opportunity for deadlocks is vastly reduced, without the need for locking hints. The first piece creates 100 "cases", each with 3 rows of "Evidence".PL/SQL triggers are block structures or pre-defined programs, which may be in-built or even explicitly developed by the programmers for a particular task.Triggers are automatically executed when an event occurs which is well thought of by the programmer in advance.Triggers are associated with response-based events such as a Database Definition Language (DDL) statement such as CREATE, DROP or ALTER or a Database Manipulation Language (DML) statement such as UPDATE, INSERT or DELETE or any other database operation such as a Startup, Shutdown, Logging in and Logging Out. Evidence ( Evidence ID int NOT NULL IDENTITY(1,1) CONSTRAINT PK_Evidence PRIMARY KEY CLUSTERED , Case ID int NOT NULL CONSTRAINT FK_Evidence_Case ID FOREIGN KEY REFERENCES dbo. Cases ( Case ID int NOT NULL IDENTITY(1,1) CONSTRAINT PK_Cases PRIMARY KEY CLUSTERED ) ON [PRIMARY]; CREATE TABLE dbo.