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Why must SELECT DISTINCT, ORDER BY expressions must appear in target list? - Mailing list pgsql-general

From Dave Smith
Subject Why must SELECT DISTINCT, ORDER BY expressions must appear in target list?
Date
Msg-id 1044903491.12751.22.camel@playpen
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Responses Re: Why must SELECT DISTINCT, ORDER BY expressions must appear in target list?  (Greg Stark <gsstark@mit.edu>)
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For this query ..

SELECT DISTINCT t0_s.rec_num FROM sample_request t0_s,
 sample_request_line_item t1_li WHERE (t1_li.fulfillment_status =
'Shipped'
AND t1_li.followup_date <= '2003-02-04 20:00:00.000000000+00' AND
(t1_li.customer_prospect_feedback IS NULL OR
t1_li.customer_prospect_feedback = '')) AND
(t0_s.rec_num=t1_li.parentRequest) ORDER BY t0_s.date_of_request DESC


I get this error.

ERROR:  For SELECT DISTINCT, ORDER BY expressions must appear in target
list


This seems like a bug. Why do I need date_of_request in the select
section? SQL Spec?

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