用一張表更新另一張表(做個標記)

-- 查詢
select
    *
from
    AreaDishes20101015002 a
inner join
    Dishes b
    on a.DishesID=b.DishesID
inner join
(
    select 品名 as dn,調整後售價 as prc,目前售價 as nprc from dbo.[菌說炒菜調價1] union
    select 品名 as dn,調整後售價 as prc,目前售價 as nprc from dbo.[菌說炒菜調價$]
) c
    on b.DishesName=c.dn and c.nprc=convert(int,replace(a.Price,'￥',''))
where
    a.Price<>'時價' and a.AreaID in(23,24)

-- 更新
update a set
    a.Price= '￥'+convert(varchar(5),c.prc)
from
    AreaDishes20101015002 a
inner join
    Dishes b
    on a.DishesID=b.DishesID
inner join
(
    select 品名 as dn,調整後售價 as prc,目前售價 as nprc from dbo.[菌說炒菜調價1] union
    select 品名 as dn,調整後售價 as prc,目前售價 as nprc from dbo.[菌說炒菜調價$]
) c
    on b.DishesName=c.dn and c.nprc=convert(int,replace(a.Price,'￥',''))
where
    a.Price<>'時價' and a.AreaID in(23,24)