Re: Extract only maximum date from column

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От Bryan Sayer
Тема Re: Extract only maximum date from column
Дата
Msg-id d0606565-1fad-419d-922c-b3e8f76495a6@gmail.com
обсуждение исходный текст
Ответ на Extract only maximum date from column  (Rich Shepard <rshepard@appl-ecosys.com>)
Ответы Re: Extract only maximum date from column
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I believe in general you need

having c.next_contact = max(c.next_contact)

(at least in ANSI SQL) Use having for after the join has occured

Bryan Sayer
Retired Demographer/Statistician
In a world in which you can be anything, be kind
On 12/4/2025 2:55 PM, Rich Shepard wrote:
I want the script to extract only the maximum `next_contact' date and
haven't learned how to do this from my reading of web sites.

The script:

select p.person_nbr, p.company_nbr, c.next_contact
from people as p, contacts as c
where c.next_contact >= '2025-11-01'
group by p.person_nbr, p.company_nbr, c.next_contact
order by p.person_nbr, p.company_nbr, max(c.next_contact);

returns all contacts rather than only the latest one.

Is using a sub-select the proper way?

TIA,

Rich


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