Create LOG for tables in SQL Server - sql-server-2008

Question

I have a table Sample and another SampleLog
With these structure I want to write codes to log. You can see my codes after structures of tables
CREATE TABLE [dbo].[Sample](
[ID] [int] NULL,
[Name] [varchar](10) NULL
)
CREATE TABLE [dbo].[SampleLog](
[ID] [int] NULL,
[Name] [varchar](10) NULL,
[Date] [datetime] NULL,
[UserName] [varchar](100) NULL,
[Type] [char](1) NULL
)
I have written this code but it doesn't work for Delete and Update .
CREATE TRIGGER SampleTrigger ON Sample
AFTER INSERT, UPDATE, DELETE
AS
DECLARE
#ID int ,
#Name varchar(10),
#Date datetime,
#UserName VARCHAR(128) ,
#Type CHAR(1) ,
#sql nvarchar(500)
SELECT
#UserName = SYSTEM_USER ,
#Date = CONVERT(VARCHAR(8), GETDATE(), 112)
+ ' ' + CONVERT(VARCHAR(12), GETDATE(), 114)
IF EXISTS (SELECT * FROM inserted)
BEGIN
IF EXISTS (SELECT * FROM deleted)
BEGIN
SELECT #Type = 'U'
select #ID = ID from deleted
select #Name = Name from deleted
END
ELSE
BEGIN
SELECT #Type = 'I'
select #ID = ID from inserted
select #Name = Name from inserted
END
END
ELSE
BEGIN
SELECT #Type = 'D'
select #ID = ID from deleted
select #Name = Name from deleted
END
insert into SampleLog(ID, Name, Date, UserName, Type)
values(#ID, #Name, #Date, #UserName, #Type)
SQL Server gives me this error
The row values updateed or deleted either do not make the row unique or they alter multiple rows(2 rows)

Answer 1

You've coded for single row updates and deletes. Think sets!
CREATE TRIGGER SampleTrigger ON Sample after INSERT, UPDATE, DELETE
AS
SET NOCOUNT ON;
insert into SampleLog
(ID,Name,Date,UserName,Type)
SELECT
D.ID, D.NAME, GETDATE(), SYSTEM_USER,
CASE WHEN I.ID IS NULL THEN 'D' ELSE 'U' END
FROM
DELETED D
LEFT JOIN
INSERTED I ON D.ID = I.ID
UNION ALL
SELECT
I.ID, I.NAME, GETDATE(), SYSTEM_USER, 'I'
FROM
INSERTED I
LEFT JOIN
DELETED D ON D.ID = I.ID
WHERE
D.ID IS NULL
GO