mysql:查询中周日期的范围是周数

我有一个类似这样的数据库表:

| id         | clock         | info
----------------------------------------------
| 1          | 1262556754    | some info
| 2          | 1262556230    | some other info
| 3          | 1262556988    | and another
| 4          | 1262555678    | and some more

它包含日志记录和一个Unix时间戳。我需要的是得到一份周报,关于每周有多少日志记录。下面是我写的一个查询:

SELECT
    DATE_FORMAT(FROM_UNIXTIME(clock), "%U") AS week
count(*) as cnt
FROM logs
WHERE DATE_FORMAT(FROM_UNIXTIME(clock), "%Y") = '2010'
GROUP BY week

结果如下:

| week       | cnt
-------------------------------
| 1           | 55 
| 2           | 134   
| 4           | 765
| 20          | 65

伟大的!但是我想看到的是日期范围 08 Feb 2010 00:00 - 15 Feb 2010 00:00 ,所以我的结果集如下所示:

| day_start           | day_end           | cnt
---------------------------------------------------------
| 08 Feb 2010 00:00   | 15 Feb 2010 00:00 | 55 
| 15 Feb 2010 00:00   | 22 Feb 2010 00:00 | 76
| 22 Feb 2010 00:00   | 01 Mar 2010 00:00 | 756

有什么办法吗?