Question

一个SQL问题，可能不是最困难的。

我正在从ID上的一堆相关表连接中查看 - ＆gt;简单。现在有一个表与所有其他表没有关键关系。（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`

好吧，我的主表'documentHistory'包含一个文档日期，我必须定义它在哪个批次中。每个批次都有一个ID和startdate。批次总是一个月。

这将使BatchDates表中的数据更容易理解：

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获取batchID，因此我们使用了startdate列的 currentMonth 。

因此：... JOD BatchDates，其中documentDate位于startDate.month中（此处之间没有）

我甚至不知道我是否需要加入，交叉加入，联合等...

提前致谢！ →

Answer 1

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

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

1 个答案: