怎样用sql语句把一个数字字段的值从小到大update了。（就像自动编号那样，从1开始）
很急，谢谢

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select identity(int,1,1) as sn,field1 into #t from t1;
update #t set field1=sn;
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create table #t(id int, ff varchar(10))

insert into #t(ff) select 'a '
insert into #t(ff) select 'b '
insert into #t(ff) select 'c '


declare @i int
set @i=0

update #t set id=@i,@i=@i+1

select * from #t


drop table #t
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# 临时表
## 全局临时表