Use d1
GO
Create Trigger Deletett2 On t1
For Delete
As
Delete A From d2.dbo.t2 A Inner Join Deleted B On A.UserID=B.UserID
GO
Create Trigger Updatet2 On t1
For Update
As
Update A Set UserName=B.UserName From d2.dbo.t2 A Inner Join Inserted B On A.UserID=B.UserID
GO