在论坛中出现的比较难的sql问题：33(递归 连续日期问题 )

原文:在论坛中出现的比较难的sql问题：33(递归 连续日期问题 )

最近，在论坛中，遇到了不少比较难的sql问题，虽然自己都能解决，但发现过几天后，就记不起来了，也忘记解决的方法了。

所以，觉得有必要记录下来，这样以后再次碰到这类问题，也能从中获取解答的思路。

MS-SQL取连续日期问题  

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

我现在需要得出表A中所有FBeginDate和FEndDate字段间的日期

下面是我的解法，使用了递归查询：

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





*/ 

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