高难度select,求解!

高难度select,求解!!!
我有一个表,描述如下：
CREATE   TABLE   REQUESTACTIVITY
(
    TIMEFROM                     TIMESTAMP(6)                                 NOT   NULL,
    REQUESTSTATUS           INTEGER                                           NOT   NULL,
)

TIMEFROMREQUESTSTATUS
4/12/2007   12:43:41.433000   AM1
4/12/2007   12:44:41.433000   AM2
4/12/2007   12:45:41.433000   AM3
4/13/2007   12:43:41.433000   AM1
4/13/2007   12:44:41.433000   AM2
4/13/2007   12:45:41.433000   AM3
4/14/2007   12:43:41.433000   AM1
4/14/2007   12:44:41.433000   AM2
4/14/2007   12:45:41.433000   AM3
4/15/2007   12:43:41.433000   AM1
4/15/2007   12:44:41.433000   AM2
4/15/2007   12:45:41.433000   AM3

现在需要根据统计出
在4月13日到4月14日，每日requeststatus为1的记录的个数，每日requeststatus为2的记录的个数，每日requeststatus为3的记录的个数

请问该怎么做？

[解决办法]
^_^
[解决办法]
:) 知道就好呀
[解决办法]
group by 要放在having前面
[解决办法]
楼上的真速度:)

[解决办法]
SELECT DAY,T1.REQUESTSTATUS,trim(DESCRIPTION),COUNT FROM
(SELECT TO_CHAR(TIMEFROM, 'MM/DD/YYYY ') DAY,REQUESTSTATUS, COUNT(REQUESTSTATUS) COUNT FROM REQUESTACTIVITY
WHERE TO_CHAR(TIMEFROM, 'MM/DD/YYYY ') > '04/12/2007 '
AND TO_CHAR(TIMEFROM, 'MM/DD/YYYY ') < '04/15/2007 '
GROUP BY TO_CHAR(TIMEFROM, 'MM/DD/YYYY '), REQUESTSTATUS) T1,
REQUESTSTATUSTYPE T2
WHERE T1.REQUESTSTATUS=T2.REQUESTSTATUS;

[解决办法]
select to_char(re.timefrom, 'MM/DD/YYYY ') day, rs.description status, count(re.requeststatus)
from requestactivity re, reqeststatustype rs
having to_char(re.timefrom, 'MM/DD/YYYY ') > '04/12/2007 '
and to_char(re.timefrom, 'MM/DD/YYYY ') < '04/15/2007 '
and re.requeststatus = rs.requeststatus
group by to_char(re.timefrom, 'MM/DD/YYYY '), re.requeststatus;

这条语句报错是因为rs.description status这个字段没内在group by 中是不能单取的
还是写成子表再关联吧