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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