Alexander Farber <alexander.far...@gmail.com> writes:
> is it please possible to rewrite the SQL query
> SELECT DISTINCT ON (uid)
> uid,
> female,
> given,
> photo,
> place
> FROM words_social
> WHERE uid IN (SELECT player1 FROM games)
> OR uid IN (SELECT player2 FROM games)
> ORDER BY uid, stamp DESC
You could do
WHERE uid IN (SELECT player1 FROM games UNION SELECT player2 FROM games)
(or possibly UNION ALL would be a trifle faster). This still reads the
"games" CTE twice; but since you're evaluating that CTE elsewhere in the
query, I think the additional follower node isn't worth trying to get
rid of.
regards, tom lane
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