sql - Sql Order by 在多列上

Question

我有以下结果

VendorName | IncidentID | IncidentStatus | IncidentDate
-------------------------------------------------------
XYZ        | 100        |     Open       | 02-JUN-2011    
XYZ        | 101        |     Open       | 03-JUN-2011  
ABC        | 102        |     Open       | 01-JUN-2011  
XYZ        | 103        |     Open       | 01-APR-2011  
ABC        | 105        |     Open       | 05-JUN-2011 

我想订购VendorName最近发生的事件。供应商ABC有最新的事件，因此它应该首先与同一供应商的所有其他事件一起出现，然后是下一个供应商，所有相应的事件按降序排列。期望的结果是这样的 -

VendorName | IncidentID | IncidentStatus | IncidentDate  
-------------------------------------------------------
ABC        | 105        |     Open       | 05-JUN-2011 
ABC        | 102        |     Open       | 01-JUN-2011
XYZ        | 101        |     Open       | 03-JUN-2011 
XYZ        | 100        |     Open       | 02-JUN-2011    
XYZ        | 103        |     Open       | 01-APR-2011  

ORDER BY IncidentDate desc, VendorName没有提供所需的输出。有什么帮助吗？

Answer 1

使用分析函数：

SELECT *
FROM(
    SELECT 
        VendorName, 
        IncidentID, 
        IncidentStatus, 
        IncidentDate, 
        MAX(IncidentDate) OVER (PARTITION BY VendorName) maxDate
    FROM yourTable
) t
ORDER BY t.maxDate DESC, t.VendorName ASC, t.IncidentDate DESC

参考： http: //docs.oracle.com/javadb/10.8.2.2/ref/rrefsqlj13658.html http://docs.oracle.com/cd/E11882_01/server.112/e10592/functions003.htm http:// /docs.oracle.com/cd/E11882_01/server.112/e26088/functions004.htm

Answer 2

这会做到...

ORDER BY MAX(INCIDENTDATE) OVER (PARTITION BY VENDORNAME) DESC, INCIDENTDATE DESC

...但我不确定 ORDER BY 中是否允许分析函数。如果不是，请在子查询中计算它并在主查询中排序...

select ...
from   (
  select Max(incidentdate) over (partition by vendorname) max_incidentdate_by_vendor,
         ...)
order by max_incidentdate_by_vender desc, incidentdate desc

Answer 3

如果您使用的是 RAC 安装

set linesize 300
column REDOLOG_FILE_NAME format a50
SELECT
    a.INST_ID,
    a.GROUP#,
    a.THREAD#,
    a.SEQUENCE#,
    a.ARCHIVED,
    a.STATUS,
    b.MEMBER    AS REDOLOG_FILE_NAME,
    (a.BYTES/1024/1024/1024) AS SIZE_GB
FROM gv$log a
JOIN gv$logfile b ON a.Group#=b.Group# 
AND a.INST_ID=b.INST_ID 
ORDER BY a.INST_ID ASC, a.GROUP# ASC;

Answer 4

select vendorname, incidentid, incidentstatus, incidentdate, max(incidentdate) 
over (partition by vendorname order by incidentdate desc) max_incidentdate
from t1 order by max_incidentdate desc, incidentdate desc