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Re: "for SELECT DISTINCT, ORDER BY expressions must appear in select list" - is that the standart or a limitation of postgresql? - Mailing list pgsql-sql

From Richard Huxton
Subject Re: "for SELECT DISTINCT, ORDER BY expressions must appear in select list" - is that the standart or a limitation of postgresql?
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Msg-id 45D46196.2090003@archonet.com
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In response to "for SELECT DISTINCT, ORDER BY expressions must appear in select list" - is that the standart or a limitation of postgresql?  ("Walter Cruz" <walter.php@gmail.com>)
Responses Re: "for SELECT DISTINCT, ORDER BY expressions must appear in select list" - is that the standart or a limitation of postgresql?
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Walter Cruz wrote:
> 
> SELECT distinct name from test order by number
> 
> (well, I think that que query doesn't make any sense, but raises the 
> error :) )
> 
> The error: ERROR:  for SELECT DISTINCT, ORDER BY expressions must
> appear in select list is due to a standart implementarion or a design
> decision of postgres?

I think ORDER BY is defined to take place after DISTINCT, which means 
there is no meaningful "number" for it to order by. You could 
arbitrarily choose the first number encountered, but I can't see what 
sense it would make to order by them.

--   Richard Huxton  Archonet Ltd

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