[英]How to Get Max Date from GROUP BY - ORACLE
这可能真的很基础,但 SQL 不是我最强的技能。 我有一个基本的 SQL 查询来获取某个位置上次完成检查的最大日期。 我也想知道这是什么类型的检查。
到目前为止,我有这个:
SELECT
facility_id
,max(inspection_date) as last_inspection
,inspection_type
FROM facility_inspections
GROUP BY facility_id ,inspection_type
这给我的结果可以为每个设施_id 的每个检查类型提供最大日期,如下所示:
-------------------------------------------------
facility id | inspection date | inspection type
-------------------------------------------------
93 04/28/2020 FULL
93 05/16/2018 VISIT
94 04/28/2020 LIMITED
94 06/12/2014 FULL
-------------------------------------------------
我想返回如下所示的结果,因为这些结果具有真正的 MAX 日期,但也显示了已完成的检查类型:
-------------------------------------------------
facility id | inspection date | inspection type
-------------------------------------------------
93 04/28/2020 FULL
94 04/28/2020 LIMITED
-------------------------------------------------
您可以在聚合查询中使用keep
:
SELECT facility_id, max(inspection_date) as last_inspection,
max(inspection_type) keep (dense_rank first order by inspection_date desc)
FROM facility_inspections
GROUP BY facility_id;
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