Re: Bringing other columns along with a GROUP BY clause

From: "Rob Richardson" <Rob(dot)Richardson(at)rad-con(dot)com>
To: "Sam Mason" <sam(at)samason(dot)me(dot)uk>, <pgsql-general(at)postgresql(dot)org>
Subject: Re: Bringing other columns along with a GROUP BY clause
Date: 2009-02-05 21:14:02
Message-ID: 04A6DB42D2BA534FAC77B90562A6A03DC57493@server.rad-con.local
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-general

Sam,

Great! I had no idea DISTINCT ON existed. That made it much simpler.
Here's what I used:

select distinct on (inventory.charge) coil_id, inventory.charge,
heating_coldspot_time_reached
from inventory
inner join charge on charge.charge = inventory.charge
where base_type = '3' and heating_coldspot_time_reached > 0 and
inventory.status = 'Done' and inventory.charge >= 1000
order by charge, heating_coldspot_time_reached desc

And thanks for the tip about E-mail. I thought that if I hit the Reply
button and then changed the subject line, it would be the same as
sending a new message to the same destination. In this case, I had to
change the destination also, so it looked like a brand new message. I
didn't know I was bringing along old baggage behind the scenes.

Thanks very much!

RobR

In response to

Browse pgsql-general by date

  From Date Subject
Next Message Rob Richardson 2009-02-05 21:31:40 Re: Bringing other columns along with a GROUP BY clause
Previous Message Tom Lane 2009-02-05 21:12:24 Re: Bringing other columns along with a GROUP BY clause