MySQL查询日期范围

Question

我用谷歌搜索,但没有找到任何相关的东西.我有一个像这样的MySQL表:

+++++++++++++++++++++++++++++++
| roomID |    date    | price |
+++++++++++++++++++++++++++++++
|  1     | 2012-10-10 |   10  |
|  1     | 2012-10-11 |   10  |
|  1     | 2012-10-12 |   10  |
|  1     | 2012-10-13 |   12  |
|  2     | 2012-10-10 |   15  |
|  2     | 2012-10-11 |   15  |
|  2     | 2012-10-12 |   15  |
|  2     | 2012-10-13 |   16  |
|  2     | 2012-10-14 |   16  |
|  2     | 2012-10-15 |   16  |
+++++++++++++++++++++++++++++++

我需要根据价格和roomID获得期限:

++++++++++++++++++++++++++++++++++++++++++++
| roomID |    from    |    till    | price |
++++++++++++++++++++++++++++++++++++++++++++
|    1   | 2012-10-10 | 2012-10-12 |   10  |
|    1   | 2012-10-13 | 2012-10-13 |   12  |
|    2   | 2012-10-10 | 2012-10-12 |   15  |
|    2   | 2012-10-13 | 2012-10-15 |   16  |
++++++++++++++++++++++++++++++++++++++++++++

谢谢!

Answer 1

select roomid,
       min(date) as from,
       max(date) as till,
       price
from periods
group by price
order by price