手欠，大半个下午加一晚上就报销了。

--select iFabricOrder, iPackageOrder,tPackageTime into #t1 from dbo.mmInDtl where sOrderNo = 'MLS_J210409M' and tPackageTime is not null

declare @i int = 0, @t datetime
--一定要在更新语句中初始化变量，再给字段赋值
update  A  set @i = case @t when tPackageTime then @i else @i+1 end,
                    iPackageOrder = @i,
                    @t = tPackageTime
from (select top 10000 * from dbo.mmInDtl where sOrderNo = 'MLS_J210409M' and tPackageTime is not null order by tPackageTime) A

--select * from #t1 order by tPackageTime

--drop table #t1
select iPackageOrder, tPackageTime from dbo.mmInDtl where sOrderNo = 'MLS_J210409M' and tPackageTime is not null order by tPackageTime