通过t1.date加入不相关的表（在t2.startdate和t2.enddate之间）

Question

SQL问题，可能不是最困难的。

我正在从一堆相关表连接的ID's - > easy进行查看。现在有一张桌子与其他所有人没有关系。 （BatchDates）

`ALTER VIEW [ECSUB].[FCT_Ext_Collection] 
AS 
SELECT  sh.id AS idSubmissionHistory, dh.id, dd.id AS Description, sch.id AS idScoringHistory, sh.CreationDate, sh.UpdateDate, bd.id AS BatchDateID 
FROM   ECSUB.SubmissionHistory AS sh INNER JOIN EC.DocumentHistory AS dh ON sh.id = dh.idSubmissionHistory 
         LEFT OUTER JOIN ECSM.ScoringHistory AS sch ON sh.idScoringHistory = sch.id 
         LEFT OUTER JOIN EC.DocumentDescriptions AS dd ON dd.id = dh.Description 
         LEFT OUTER JOIN ECSUB.AddressBilling AS ab ON sh.id = ab.id 
         LEFT OUTER JOIN ECSUB.AddressPremise AS ap ON sh.id = ap.id 
         CROSS JOIN EC.BatchDates AS bd --ON sh.documentdate between ....... 

GO` 

好了，我的主表“documentHistory”包含文件的日期，我必须定义在该批次下降。 每批有一个ID和startdate。一批总是一个月。

这将使它更容易理解，从BatchDates表中的数据：

id month startdate 
1 2010-12-01 00:00:00.000 2010-12-01 00:00:00.000 
1 2011-01-01 00:00:00.000 2010-12-01 00:00:00.000 
1 2011-02-01 00:00:00.000 2010-12-01 00:00:00.000 
2 2011-03-01 00:00:00.000 2011-03-01 00:00:00.000 
2 2011-04-01 00:00:00.000 2011-03-01 00:00:00.000 
2 2011-05-01 00:00:00.000 2011-03-01 00:00:00.000 
3 2011-06-01 00:00:00.000 2011-06-01 00:00:00.000 
3 2011-07-01 00:00:00.000 2011-06-01 00:00:00.000 
3 2011-08-01 00:00:00.000 2011-06-01 00:00:00.000 
4 2011-09-01 00:00:00.000 2011-09-01 00:00:00.000 
4 2011-10-01 00:00:00.000 2011-09-01 00:00:00.000 
4 2011-11-01 00:00:00.000 2011-09-01 00:00:00.000 
5 2011-12-01 00:00:00.000 2011-12-01 00:00:00.000 
5 2012-01-01 00:00:00.000 2011-12-01 00:00:00.000 
5 2012-02-01 00:00:00.000 2011-12-01 00:00:00.000 
6 2012-03-01 00:00:00.000 2012-03-01 00:00:00.000 
6 2012-04-01 00:00:00.000 2012-03-01 00:00:00.000 
6 2012-05-01 00:00:00.000 2012-03-01 00:00:00.000 
7 2012-06-01 00:00:00.000 2012-06-01 00:00:00.000 
7 2012-07-01 00:00:00.000 2012-06-01 00:00:00.000 
7 2012-08-01 00:00:00.000 2012-06-01 00:00:00.000 
8 2012-09-01 00:00:00.000 2012-09-01 00:00:00.000 
8 2012-10-01 00:00:00.000 2012-09-01 00:00:00.000 
8 2012-11-01 00:00:00.000 2012-09-01 00:00:00.000 
9 2012-12-01 00:00:00.000 2012-12-01 00:00:00.000 
9 2013-01-01 00:00:00.000 2012-12-01 00:00:00.000 
9 2013-02-01 00:00:00.000 2012-12-01 00:00:00.000 
10 2013-03-01 00:00:00.000 2013-03-01 00:00:00.000 
10 2013-04-01 00:00:00.000 2013-03-01 00:00:00.000 
10 2013-05-01 00:00:00.000 2013-03-01 00:00:00.000 
etc........... 

所以我需要根据documentdate去取batchID，因此我们使用的列currentMonth开始日期。

这样：... JOIN BatchDates其中documentDate是startDate.month（没有此之间）

我甚至不知道我是否需要一个连接，交叉连接，工会等...

在此先感谢！ L

Answer 1

join BatchDates 
on datepart(yyyy,[document date]) = datepart(yyyy,[startDate]) 
and datepart(mm,[document date]) = datepart(mm,[startDate])