FIRST_VALUE argument must appear in group by?

From: Guyren Howe <guyren(at)gmail(dot)com>
To: pgsql-general <pgsql-general(at)postgresql(dot)org>
Subject: FIRST_VALUE argument must appear in group by?
Date: 2016-05-17 03:01:31
Message-ID: C7F93FD9-A087-434D-A05F-F5F85F2BC7AF@gmail.com
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I have this SELECT clause as part of a larger query:
FIRST_VALUE(drs.id) OVER (PARTITION BY drs.order_ID ORDER BY drs.position ASC) AS current_drs_id
Seems reasonable to me: group and sort the fields in this table and give me the first value.

But I get "column "drs.id" must appear in the GROUP BY clause or be used in an aggregate function".

Huh?

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