在Sql Server触发器中判断操作是Insert还是Update还是Delete

DECLARE
    @IsInsert bit,
    @IsUpdate bit,
    @IsDelete bit

IF EXISTS(SELECT 1 FROM inserted) AND NOT EXISTS(SELECT 1 FROM deleted)
    SET @IsInsert = 1
ELSE
    SET @IsInsert = 0

IF EXISTS(SELECT 1 FROM inserted) AND EXISTS(SELECT 1 FROM deleted)
    SET @IsUpdate = 1
ELSE
    SET @IsUpdate = 0

IF NOT EXISTS(SELECT 1 FROM inserted) AND EXISTS(SELECT 1 FROM deleted)
    SET @IsDelete = 1
ELSE
    SET @IsDelete = 0 
create   trigger   Update_Del   on   Table  
  for   update,delete  
  as  
  if   not   exists(select   1   from   inserted)  
  begin   /*inserted表无记录，是删除*/  
  end  
  else    
  begin   /*是更新*/   end  
  go