Re: Forward declaration of table

Hi Igor,

On Tue, Aug 23, 2016 at 8:15 PM, Igor Neyman <ineyman(at)perceptron(dot)com> wrote:

> mailto:pgsql-general-owner(at)postgresql(dot)org] *On Behalf Of *Alexander Farber
>
>
https://gist.github.com/afarber/c40b9fc5447335db7d24
>
>
>
> Certain MOVE exists only within particular GAME: no GAME -> no MOVE (on
> delete cascade).
>
> So, you don’t need mid1, mid2 columns in WORD_GAMES table.
>
> What you need is this column in WORD_MOVES table:
>
>
>
> gid integer REFERENCES WORD_GAMES ON DELETE CASCADE
>
>
>

you are correct, but I need to send most recent move in each game together
with the other game data.

If I don't store the recent moves in mid1, mid2 then I'd have to retrieve
them every time dynamically with

WITH last_moves AS (
SELECT *
FROM words_moves wm1
WHERE
played = (SELECT max(played)
FROM words_moves wm2
WHERE wm1.gid = wm2.gid))
SELECT *
FROM words_games wg
LEFT JOIN last_moves lm
ON (wg.gid = lm.gid)
WHERE
player1 = 1 OR
player2 = 1;

Regards
Alex