就这些分，请人帮忙看看这段sql代码,该怎么处理

就这些分，请人帮忙看看这段sql代码
create   proc   Depth
as
declare     @Count   int   ,@Date   datetime,@CountIp   varchar(200),@Depth   int
DECLARE   Flow_CUR   CURSOR     FOR  
select   subString(CONVERT(varchar,   CountTime,   120   ),0,CHARINDEX( ': ',CountTime))+ ':00:00 '   as   Date,  
CountIp,count(CountUrl)   as   Depth  
from   Count_ReturnAndDepth   where   CustomerID= '1 'and   StatisticsDepthOrFalse=2   group   by   CountIp,
subString(CONVERT(varchar,   CountTime,   120   ),0,CHARINDEX( ': ',CountTime))+ ':00:00 ',HostName    
      OPEN     Flow_CUR
      fetch   next   from   Flow_CUR   into   @Date,@CountIp,@Depth

      WHILE   (@@FETCH_STATUS)   =   0  

  BEGIN
select   @Count=DepthCount   from   Count_DepthInformation   where   CustomerID= '1 'and   CountIP=@CountIp   and   PostTime=@Date
if   exists(select   1   from   Count_DepthInformation   where   CustomerID= '1 'and   CountIP=@CountIp   and
PostTime=@Date)update   Count_DepthInformation   set   DepthCount=1   +@Count     where   CustomerID= '1 '
and   CountIP=@CountIp   and   PostTime=@Date
else   insert   into   Count_DepthInformation   (CustomerID,CountIp,DepthCount,PostTime)  
values   ( '1 ',@CountIp, '1 ',@Date)

      FETCH   NEXT   FROM   Flow_CUR   into   @Date,@CountIp,@Depth
      END
CLOSE   Flow_CUR
DEALLOCATE   Flow_CUR
Update   Count_ReturnAndDepth   set   StatisticsDepthOrFalse=1   where   StatisticsDepthOrFalse=0
----------------------------------------------------
在做一个流量的统计，关系到两个表，我使用游标测试时，速度超慢，4000条要运行2分多钟，不知道能不能使用其他办法改进，请大家帮忙看看，谢谢！！

------解决方案--------------------
自己先测一下是哪步引起效率极低的吧，根据测试结果来更改一些主要的内容。
比如先测一下
SELECT CONVERT(CHAR(13), CountTime, 120 )+ ':00:00 ' AS Date,CountIp,COUNT(1) AS Depth
FROM Count_ReturnAndDepth
WHERE CustomerID= '1 'AND StatisticsDepthOrFalse=2
GROUP BY CountIp,Date,HostName
--看看耗时多久。
如果耗时长的话想办法优化此句。
------解决方案--------------------
up