我有一个Oracle select需要在SQL Server中执行（表从Oracle数据库导出到SQL Server数据库）。我可以将nvl替换为isnull，并使用case进行解码，但如何在此特定情况下处理rowid？

select sum(
  nvl(
    (select sum(b.restsaldo) from reskontro.erkrysskid b
    where 1=1
    and b.fakturanr = a.fakturanr
    and b.kundenr = a.kundenr
    and b.resknr = b.resknr
    and a.rowid = decode(a.reskfunknr,31,a.rowid,b.rowid)
    and nvl(b.restsaldo,0) <> 0
    and b.krysskidid <= a.krysskidid
    and not exists (select * from reskontro.erkrysskid c
      where b.kundenr = c.kundenr
      and b.resknr = c.resknr
      and a.resklinr < c.resklinr
      and a.krysskidid < c.krysskidid
      and b.fakturanr = c.fakturanr
      and c.reskfunknr in (31,75)
      and nvl(c.attfort,-1) = -1)
      ),0
    )
) as restsaldo from reskontro.erkrysskid a 
where 1=1
and a.kundenr = 1 
and a.resknr = 1