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    If CosmosDB doesn't have window functions, then you want greatest-n-per-group - if user_name is a PK, then you should be able to SELECT c.user_name, MAX(c.date_time) AS mdt FROM checkup_data c GROUP BY c.user_name and then join that back to checkup_data on the PK and mdt - taking the bp and temp... I did something like this today here - there's links within also. Commented Apr 8, 2021 at 19:42
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    I threw together this - if no window functions are available... Commented Apr 8, 2021 at 20:09
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    Thanks Verace. I think JOIN ON is different for Azure Cosmos. This example only has JOIN IN. I will try to adapt your code. Commented Apr 9, 2021 at 15:27