我有这个简单的查询：
select quarter(invitation_date) as `iQuarter`, invitation_date as `iDate`,count(*) as count from data group by iQuarter,iDate with rollup
我希望得到一张这样的表：
+----------+------------+-------+
| iQuarter | iDate | count |
+----------+------------+-------+
| 1 | 2010-02-23 | 133 |
| 1 | 2010-03-02 | 14 |
| 1 | 2010-03-09 | 74 |
| 1 | 2010-03-15 | 102 |
| 1 | 2010-03-22 | 76 |
| 1 | 2010-03-30 | 16 |
| NULL | NULL | 415 |
| 2 | 2010-04-06 | 20 |
| 2 | 2010-04-12 | 84 |
| 2 | 2010-04-19 | 85 |
| 2 | 2010-04-26 | 51 |
| 2 | 2010-05-03 | 73 |
| 2 | 2010-05-11 | 76 |
| 2 | 2010-05-18 | 54 |
| 2 | 2010-05-24 | 83 |
| 2 | 2010-06-01 | 73 |
| 2 | 2010-06-07 | 74 |
| 2 | 2010-06-24 | 81 |
| 2 | 2010-06-28 | 110 |
| NULL | NULL | 864 |
+----------+------------+-------+
但是我得到的总数处于错误的位置，在每个季度之前我们总共有一行与下一季度的计数为1。
+----------+------------+-------+
| iQuarter | iDate | count |
+----------+------------+-------+
| 1 | 2010-02-23 | 1 |
| NULL | NULL | 1 |
| 1 | 2010-02-23 | 132 |
| 1 | 2010-03-02 | 14 |
| 1 | 2010-03-09 | 74 |
| 1 | 2010-03-15 | 102 |
| 1 | 2010-03-22 | 76 |
| 1 | 2010-03-30 | 16 |
| 2 | 2010-04-06 | 1 |
| NULL | NULL | 415 |
| 2 | 2010-04-06 | 19 |
| 2 | 2010-04-12 | 84 |
| 2 | 2010-04-19 | 85 |
| 2 | 2010-04-26 | 51 |
| 2 | 2010-05-03 | 73 |
| 2 | 2010-05-11 | 76 |
| 2 | 2010-05-18 | 54 |
| 2 | 2010-05-24 | 83 |
| 2 | 2010-06-01 | 73 |
| 2 | 2010-06-07 | 74 |
| 2 | 2010-06-24 | 81 |
| 2 | 2010-06-28 | 110 |
| 3 | 2010-07-06 | 1 |
| NULL | NULL | 864 |
+----------+------------+-------+
邀请日期定义为：
+-------------------+---------------------------+------+-----+---------------------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------------------+---------------------------+------+-----+---------------------+-------+
| invitation_date | date | NO | | | |
+-------------------+---------------------------+------+-----+---------------------+-------+
任何人都知道为什么会发生这种情况？ Mysql版本：5.0.27