On 28 October 2016 at 13:03, Alexander Farber
<alexander.farber@xxxxxxxxx> wrote:
> Hello,
>
> 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
>
> where first column player1 is fetched in a subquery and then column player2
> is fetched from the same table?
>
> I've searched around and it seems that a JOIN should be used here, but can
> not figure out exactly how.
>
> Thank you
> Alex
You mean like this?:
SELECT DISTINCT ON (uid)
uid,
female,
given,
photo,
place
FROM words_social
JOIN games ON uid IN (player1, player2)
ORDER BY uid, stamp DESC
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