触发以使用自动增量值更新另一个表

Question

I'm having trouble creating a trigger for my database.

I Have two tables, lets call them A and AHistory.

A has an ID and a value.

I want AHistory to keep track of the value and date for a set time.

AHistory Has an Auto Incremented ID, the value and a timestamp.

this is as far as I have gotten:

CREATE TRIGGER Atrigger 
   ON  A
   AFTER INSERT
AS 
BEGIN    
    INSERT INTO AHistory
    SELECT value FROM INSERTED
END
GO

Answer 1

Assuming that your db schema looks like

CREATE TABLE a
   (id int identity primary key, 
     value varchar(32));

CREATE TABLE ahistory
   (id int identity primary key, 
     aid int, value varchar(32), 
     eventdate datetime);

Your trigger might look like

CREATE TRIGGER atrigger ON  A
AFTER INSERT AS 
    INSERT INTO ahistory (aid, value, eventdate)
    SELECT id, value, GETDATE() FROM INSERTED;

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