如何为以下方案构建SQL查询？

Question

我有一个看起来像这样的表：

Name    Post       Like Share   Comment Date
--------------------------------------------
Sita    test data 1 5   2   4   28/4/2015
Munni   test data 2 5   2   5   27/4/2015
Shila   test data 3 1   3   1   22/4/2015
Ram     Test data 4 5   0   5   1/4/2015
Sam     Test data 5 4   0   2   2/4/2015
Jadu    Test data 6 1   5   2   30/3/2015
Madhu   Test data 7 5   0   4   10/4/2015

现在我想要我的结果集如下：

Type            Name      Post      Like  Share Comment Date
-------------------------------------------------------------------------
Today           Sita    test data 1    5    2   4       28/4/2015
Last 7 Days     Sita    test data 1    5    2   4       28/4/2015
Last 7 Days     Munni   test data 2    5    2   5       27/4/2015
Last 7 Days     Shila   test data 3    1    3   1       22/4/2015
Last 30 Days    Sita    test data 1    5    2   4       28/4/2015
Last 30 Days    Munni   test data 2    5    2   5       27/4/2015
Last 30 Days    Shila   test data 3    1    3   1       22/4/2015
Last 30 Days    Ram     Test data 4    5    0   5       1/4/2015
Last 30 Days    Sam     Test data 5    4    0   2       2/4/2015
Last 30 Days    Jadu    Test data 6    1    5   2       30/3/2015
Last 30 Days    Madhu   Test data 7    5    0   4       10/4/2015

今天必须只有今天的帖子。过去7天必须有今天的帖子+过去7天的帖子。最近30天列必须包含过去30天的所有帖子。

Answer 1

一些具有不同案例陈述的工会可以获得日期范围。

Answer 2

使用union all和dateadd：

select 'Today' as Type, Name, Post, [Like], Share, Comment, [Date]
from yourtable
where [Date] = getdate()
union all 
select 'Last 7 Days' as Type, Name, Post, [Like], Share, Comment, [Date]
from yourtable
where [Date] >= DateAdd(day,-7,getdate())
union all 
select 'Last 30 Days' as Type, Name, Post, [Like], Share, Comment, [Date]
from yourtable
where [Date] >= DateAdd(day,-30,getdate())

BTW，列名的可怕选择（不要使用保留字）。