delete from
    ITEM
where
    not exists(
        select
            ITEM_CODE
        from
            STOCK
        where
            ITEM.ITEM_CODE = STOCK.ITEM_CODE
    )
    or (
        ITEM_CODE = (
            select
                ITEM_CODE
            from
                STOCK
            group by
                STOCK.ITEM_CODE
            having
                max(coalesce(LAST_DELIVERY_DATE, '2023-06-01')) < date('2023-06-01', '-6 month')
                and sum(ACTUAL_AMT) = 0
        )
        and STOCK_MANAGEMENT_TYPE = 1
    )