player INTEGER NOT NULL REFERENCES players,
song INTEGER NOT NULL REFERENCES songs,
- playmode VARCHAR NOT NULL CHECK playmode IN ('single','double'),
- difficulty VARCHAR NOT NULL CHECK difficulty IN ('beginner','standard','difficult','expert','challenge'),
+ playmode VARCHAR CHECK playmode IS NULL OR playmode IN ('single','double'),
+ difficulty VARCHAR CHECK difficulty IS NULL OR difficulty IN ('beginner','standard','difficult','expert','challenge'),
+ chosen BOOLEAN NOT NULL,
score INTEGER NOT NULL CHECK (score >= 0 AND score <= 10000),
+ FOREIGN KEY (song) REFERENCES songs (song),
FOREIGN KEY (song, playmode, difficulty) REFERENCES songs (song, playmode, difficulty),
- FOREIGN KEY (tournament, round, parallel) REFERENCES groups (tournament, round, parallel),
- PRIMARY KEY (tournament, round, parallel, player, songs)
-);
+ FOREIGN KEY (tournament, round, parallel, player) REFERENCES roundparticipation (tournament, round, parallel, player),
+ PRIMARY KEY (tournament, round, parallel, player, song)
+);