with STOCK_SUB1 as 
(
    select ITEM_CODE, MAX(LAST_DELIVERY_DATE) LAST_DELIVERY_DATE, sum(ACTUAL_AMT) ACTUAL_AMT
    from STOCK
    group by ITEM_CODE
)
, STOCK_SUB2 as
(
    select ITEM_CODE, LAST_DELIVERY_DATE
    from STOCK_SUB1
    where LAST_DELIVERY_DATE <= DATE('2023-06-01', '-6 months')
    and ACTUAL_AMT = 0
)
delete from ITEM
where ITEM_CODE in (select ITEM_CODE from STOCK_SUB2)
and STOCK_MANAGEMENT_TYPE = '1';
select count(*) from item;