sql problem more difficult to appear in the forum: 33 (recursive continuous problems with dates)

Original: SQL problem more difficult to appear in the forum: 33 (recursive continuous problems with dates)

Recently, in the forum, I met a lot more difficult sql problem, although they can be resolved, but found a few days later, they can not remember, forget the solution of.

So, I feel the need to be recorded, so that after the encounter this problem again, and get answers from the idea. 

MS-SQL problems take consecutive days  

http://bbs.csdn.net/topics/390635235?page=1#post-395995697

I now need to come to the table A date between all FBeginDate and FEndDate field

Here is my solution, using a recursive query:

    
    
drop table tb

create table tb(FBeginDate datetime,FEndDate datetime)

insert into tb
select '2010-10-01', '2010-10-01'
union all select '2010-10-01', '2010-10-07'
union all select '2011-01-30', '2011-02-12'


;with t
as
(
select 1 as number
union all
select number + 1
from t
where t.number < 100
)

select tb.FBeginDate,
tb.FEndDate,
dateadd( day,t.number -1,FBeginDate) as '两个日期之间的天'
from tb
inner join t
on datediff( day,FBeginDate,FEndDate) + 1 >= t.number
order by tb.FBeginDate,
'两个日期之间的天'

/*
FBeginDate FEndDate 两个日期之间的天
2010-10-01 00:00:00.000 2010-10-01 00:00:00.000 2010-10-01 00:00:00.000
2010-10-01 00:00:00.000 2010-10-07 00:00:00.000 2010-10-01 00:00:00.000
2010-10-01 00:00:00.000 2010-10-07 00:00:00.000 2010-10-02 00:00:00.000
2010-10-01 00:00:00.000 2010-10-07 00:00:00.000 2010-10-03 00:00:00.000
2010-10-01 00:00:00.000 2010-10-07 00:00:00.000 2010-10-04 00:00:00.000
2010-10-01 00:00:00.000 2010-10-07 00:00:00.000 2010-10-05 00:00:00.000
2010-10-01 00:00:00.000 2010-10-07 00:00:00.000 2010-10-06 00:00:00.000
2010-10-01 00:00:00.000 2010-10-07 00:00:00.000 2010-10-07 00:00:00.000
2011-01-30 00:00:00.000 2011-02-12 00:00:00.000 2011-01-30 00:00:00.000
2011-01-30 00:00:00.000 2011-02-12 00:00:00.000 2011-01-31 00:00:00.000
2011-01-30 00:00:00.000 2011-02-12 00:00:00.000 2011-02-01 00:00:00.000
2011-01-30 00:00:00.000 2011-02-12 00:00:00.000 2011-02-02 00:00:00.000
2011-01-30 00:00:00.000 2011-02-12 00:00:00.000 2011-02-03 00:00:00.000
2011-01-30 00:00:00.000 2011-02-12 00:00:00.000 2011-02-04 00:00:00.000
2011-01-30 00:00:00.000 2011-02-12 00:00:00.000 2011-02-05 00:00:00.000
2011-01-30 00:00:00.000 2011-02-12 00:00:00.000 2011-02-06 00:00:00.000
2011-01-30 00:00:00.000 2011-02-12 00:00:00.000 2011-02-07 00:00:00.000
2011-01-30 00:00:00.000 2011-02-12 00:00:00.000 2011-02-08 00:00:00.000
2011-01-30 00:00:00.000 2011-02-12 00:00:00.000 2011-02-09 00:00:00.000
2011-01-30 00:00:00.000 2011-02-12 00:00:00.000 2011-02-10 00:00:00.000
2011-01-30 00:00:00.000 2011-02-12 00:00:00.000 2011-02-11 00:00:00.000
2011-01-30 00:00:00.000 2011-02-12 00:00:00.000 2011-02-12 00:00:00.000
*/