在网站找一段，发现并没有达到自己的要求：

这段程序功能是 为某空字段自动编号（系统运用时，新加的编号字段，前期有数据，需要重新编号）

declare @id int

declare @maxid int
set @id=1
select @maxid=count(*) from t_Send_Revisit Where fSO is null
begin
while @id<=@maxid
begin
update s set fSO =(Select 'SR' +CONVERT(varchar(100), GETDATE(), 112)+ '-' +RIGHT('0000'+convert(varchar,@id),4)) from t_Send_Revisit s
inner join (select top 1 * From t_Send_Revisit Where fSO is null ) t on t.SSO=s.SSO and t.STime = s.STime and t.fSNo= s.fSNo and s.CustCode = t.CustCode
set @id=@id+1
end
end

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