我需要一个选择查询来根据其中更新的最新报告列出ReportGroup。
例如,此查询列出了具有最大创建日期的报告组:
SELECT TOP 100 PERCENT rg.ReportGroupID
FROM Report.ReportGroups as rg
INNER JOIN Report.Reports as r ON rg.ReportGroupID = r.ReportGroupID
GROUP BY rg.ReportGroupID
ORDER BY MAX(CreateDate) DESC
输出:
20|2015-02-28
8 |2015-02-17
1 |2015-02-10
36|2015-01-11
25|2014-12-20
18|2014-12-16
现在,我需要所有ReportGroup列:
SELECT *
FROM Report.ReportGroups
WHERE ReportGroupID IN (
SELECT TOP 100 PERCENT rg.ReportGroupID
FROM Report.ReportGroups as rg
INNER JOIN Report.Reports as r ON rg.ReportGroupID = r.ReportGroupID
GROUP BY rg.ReportGroupID
ORDER BY MAX(CreateDate) DESC
)
输出:
1 |Group 1
8 |Group 8
18|Group 18
20|Group 20
25|Group 25
36|Group 36
但此查询的结果与上一个查询的排序方式不同。
感谢。
答案 0 :(得分:1)
您可以使用外部申请执行此操作:
SELECT
rg.*
FROM
Report.ReportGroups as rg
outer apply (
select top 1 r.CreateDate
from Report.Reports as r
where rg.ReportGroupID = r.ReportGroupID
order by r.CreateDate DESC
) r
ORDER BY
r.CreateDate DESC
答案 1 :(得分:1)
我认为这是你正在寻找的东西。已更改为基于联接的选择,并按内部(最大)创建的顺序排序。
SELECT rg1.*
FROM Report.ReportGroups rg1
JOIN (
SELECT TOP 100 PERCENT rg.ReportGroupID, MAX(CreateDate) createdate
FROM Report.ReportGroups as rg
INNER JOIN Report.Reports as r ON rg.ReportGroupID = r.ReportGroupID
GROUP BY rg.ReportGroupID
ORDER BY MAX(CreateDate) DESC
) trg ON rg1.ReportGroupID = trg.ReportGroupID
ORDER BY trg.createdate;