Выбрать значения которых нет в таблице

SELECT * 
FROM table 
WHERE 
    item_id IN (2, 3, 5) 
AND 
    item_id NOT IN (SELECT item_id FROM table);

SET @var = '{2}{3}{5}';
SELECT 
SUBSTRING
(
    @var := REPLACE
    (
        (	
            SELECT @var := REPLACE(@var, concat('{', `item_id`, '}'), '') AS `ids`
            FROM `table` 
            ORDER BY `ids` DESC 
            LIMIT 0,1
        ),
        '}{', 
        ','
    ), 
    2, 
    length(@var) - 2
)