How to query by recent date and value in SQL?

Posted by wsb3383 on Stack Overflow See other posts from Stack Overflow or by wsb3383
Published on 2010-05-16T23:09:42Z Indexed on 2010/05/16 23:10 UTC
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I have a table with three columns: patient_id, obs_date, and weight_val. patient_id stores patient identification #, weight_val stores a weight value, and obs_date stores the date when the weight reading was taken. So, a patient can have many different weight readings at different dates.

How do you write a query for:

select all patients whose last weight reading is > 120?

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