with 
average as (
  select
      GOODS_CODE
    , round(avg(STD_COST_PRICE)) as AVG_STD_COST_PRICE
  from
      SKU
  group by
      GOODS_CODE
),
targets as (
  select
      s.SKU_CODE
  from
                      SKU     s
      left outer join average a using(GOODS_CODE)
  where
      s.STD_COST_PRICE < a.AVG_STD_COST_PRICE
)
update
    SKU
set
    STD_COST_PRICE       = (select STD_COST_PRICE from GOODS g where g.GOODS_CODE = GOODS_CODE)
  , UPDATE_USER_NAME     = 'MODIFY'
  , USER_UPDATE_DATETIME = '2024-08-31 00:00:00'
from
  targets
where
    SKU.SKU_CODE = targets.SKU_CODE
;