UPDATE 
      dbo.Table2   
SET
      dbo.Table2.ColB = dbo.Table2.ColB + dbo.Table1.ColB  


FROM 
      dbo.Table2   

INNER JOIN 
      dbo.Table1   

ON
      Table2.ColA = Table1.ColA

declare @發票號碼 varchar(16)
set @發票號碼='ZB56491199'

update
      統一發票單身
set
      統一發票單身.順序=a.新順序
from
      (select 
            100+row_number() over (order by 原始順序 asc) as 新順序,
            順序
      from 
            統一發票單身
      where 
            發票號碼=@發票號碼) as a
where
      統一發票單身.發票號碼=@發票號碼
      and 統一發票單身.順序=a.順序

update 統一發票單身
set 順序=順序-100
where 發票號碼=@發票號碼