如何在SQL Server 2008 R2中添加具有其他列值作为默认值的列？

Question

I have a table emp which has 4 columns : emp_cd, emp_name, updated_by, update_dt .

Now I am to add another column named as inserted_by .

When I insert anything in table, the value of inserted_by column should be set same as updated_by .

When I update table update_by column value will be updated but inserted_by column value should remain unchanged.

Answer 1

Use a trigger on INSERT:

CREATE TRIGGER trig_Insert_Emp
ON [emp]
FOR INSERT
AS
Begin
    Update [emp] 
    Set inserted_by = ( Your_Values_Or_Subquery )
    from Inserted i
    Left Join emp e
    on i.emp_cd = e.emp_cd 
End

Take a look to AFTER INSERT too.