Hi Igor, On Tue, Aug 23, 2016 at 8:15 PM, Igor Neyman <iney...@perceptron.com> wrote:
> mailto:pgsql-general-ow...@postgresql.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
