每次查询表中的一条数据，遍历整个表

declare @a int
select @a=20
--COUNT(*) from SEC_SecureUser
while(@a>0)
begin
select top 1 suUserID,SUID from SEC_SecureUser where SUID not in(select top (@a-1) SUID from SEC_SecureUser order by SUID asc) order by SUID asc
set @a=@a-1;
end