from http://blog.joycode.com/ghj/archive/2006/12/18/89216.aspx
有段时间，CSDN的揭帖总随机出些问题，得分人数得分总和小于帖子分数。
揭帖这里，使用了SQL 的游标，核心代码如下：
declare mycursorxx scroll cursor for select ..... FROM .... where ..... order by ....
open mycursorxx
fetch first from mycursorxx into @PostUserId,@Point,@ReplyID
while @@fetch_status = 0
begin
...............
fetch NEXT from mycursorxx into @PostUserId,@Point,@ReplyID
end
分析进去后，上面的游标定义有并发处理的问题，修改成以下方式就没有了
declare mycursorxx cursor scroll static for select ..... FROM .... where ..... order by ....
open mycursorxx
fetch first from mycursorxx into @PostUserId,@Point,@ReplyID
while @@fetch_status = 0
begin
...............
fetch NEXT from mycursorxx into @PostUserId,@Point,@ReplyID
end
核心就是把这个游标定义成静态游标，就可以避免上述问题的发生。