Re: ids from grouped rows

From: Weinzierl Stefan <Stefan(at)Weinzierl-Stefan(dot)de>
To: pgsql-sql(at)postgresql(dot)org
Subject: Re: ids from grouped rows
Date: 2005-07-20 14:09:23
Message-ID: kh22r2-upc.ln1@router.privat
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Lindsay schrieb:
> Lets say i do this:
>
> SELECT name, MAX(age)
> FROM Person
> GROUP BY name
>
> This will group people who have the same name together, and return the
> highest age for each group. I want to be able to find the id for the
> person with the highest age in each group -
>
> Ideally, it would be something like this
>
> SELECT name, MAX(age), id_for_row_with_max_age
> FROM Person
> GROUP BY name

SELECT name, age, id FROM Person RIGHT JOIN (SELECT name, MAX(age) AS m
FROM Person GROUP BY name) AS t ON (Person.name=t.name AND Person.age=t.m)

Stefan

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