Question

我试图使用over（partition）子句来选择一个选择带max（noteid）记录的记录。

首先，当我运行此查询时，我得到了返回两条记录的预期结果：

select driveid, text, noteid from rpt_notesdetail where driveid='628678'
and Reason in (select codeid from rpt_QuickCodes where DescShort like N'Publicity')

我明白了 DriveID： 628678，文字：所有捐赠者都会收到免费T恤，两张即兴票和泽西迈克的子优惠券！ NoteID：< / strong> 1410233

DriveID ：628678，文字：所有捐赠者都会收到免费T恤，两张即兴票和泽西迈克的子优惠券！ NoteID： 1410234

但是当我尝试使用over（分区）SQL时：

(select text from (select (Text), noteid, max(noteid) over (partition by driveid) as 'max_note' from rpt_NotesDetail where DriveID='628678' and createdate = (select max(createdate) from rpt_notesdetail where DriveID='628678') and Reason in (select codeid from rpt_QuickCodes where DescShort like N'Publicity')) AS A where A.noteid = A.max_note)

返回没有结果。关于我在这里缺少什么的任何建议？

Answer 1

我认为你正在努力做到这一点。看看你是否更喜欢这种方式，它还可以让你更好地找到问题。我想这可能是因为你没有在你的subselect中包含“和noteid = ...”max（createdate）。

(select text from 
(
select (Text), noteid, row_number() over (partition by driveid order by noteid desc) as row_num
from rpt_NotesDetail 
where DriveID='628678' 
and createdate = (select max(createdate) from rpt_notesdetail where DriveID='628678') 
and Reason in (select codeid from rpt_QuickCodes where DescShort like N'Publicity')
) AS A 
-- comment out this line to see all rows, possibly showing the data problem
where A.row_num = 1
)

Answer 2

根据Tim Lehner的建议，我将Reason子查询放在createdate子查询中并且它可以工作：

(select text from (select (Text), noteid, max(noteid) over (partition by driveid) as 'max_note'
from rpt_NotesDetail where DriveID="DriveMaster"."DriveID" and createdate =
(select max(createdate) from rpt_notesdetail where
DriveID="DriveMaster"."DriveID" and Reason in
(select codeid from rpt_QuickCodes where DescShort like N'Publicity'))) AS A
where A.noteid = A.max_note)

Over（Partition）SQL - 没有结果

2 个答案: