This is probably really basic but SQL is not my strongest skill set. I have a basic SQL query to get the max date of the last inspection completed for a location. I also want to know what type of inspection it was.
So far I have this:
SELECT
facility_id
,max(inspection_date) as last_inspection
,inspection_type
FROM facility_inspections
GROUP BY facility_id ,inspection_type
which gives me results that can have max dates for each inspection type for each each facility_id like this:
-------------------------------------------------
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
-------------------------------------------------
I want to return results that look like the follow because those have the true MAX date but also shows me the type of inspection that was completed:
-------------------------------------------------
facility id | inspection date | inspection type
-------------------------------------------------
93 04/28/2020 FULL
94 04/28/2020 LIMITED
-------------------------------------------------
You can use keep
in an aggregation query:
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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