How to select just parent and not inherit values - sql

Question

I have 3 tables. Game, FinalGame which extends Game and Participant who has list of game and list of FinalGame. Now I have problem. How to select just game and not finalGame. How to select Participant with just game and not finalGame.
In first option I tried:
select * from game g where {g.ID not in (select pl.game_id from PLAY_OFF_TABLE pl) }
but I am not sure if it is right.
In second option I tried;
select * from participant p left join game g1 on p.ID = g1.HOME_PARTICIPANT_ID
but this select all games including final. I have no idea how I can exclude final game
CREATE TABLE IF NOT EXISTS `GAME` (
`ID` int(11) NOT NULL AUTO_INCREMENT,
`HOME_PARTICIPANT_ID` int(11) DEFAULT NULL,
`AWAY_PARTICIPANT_ID` int(11) DEFAULT NULL,
`STATUS` enum('WIN','LOSE','DRAW') DEFAULT NULL,
`RESULT` varchar(50) DEFAULT NULL,
PRIMARY KEY (`ID`),
KEY `HOME_PARTICIPANT_ID` (`HOME_PARTICIPANT_ID`),
KEY `AWAY_PARTICIPANT_ID` (`AWAY_PARTICIPANT_ID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=10 ;
CREATE TABLE IF NOT EXISTS `PLAY_OFF_GAME` (
`GAME_ID` int(11) NOT NULL,
`GROUP_ID` int(11) NOT NULL,
`POSITION` int(11) NOT NULL,
PRIMARY KEY (`GAME_ID`),
KEY `GROUP_ID` (`GROUP_ID`),
KEY `POSITION` (`POSITION`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE IF NOT EXISTS `PARTICIPANT` (
`ID` int(11) NOT NULL AUTO_INCREMENT,
...
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=10 ;
UPDATE:
select * from PARTICIPANT p left join GAME g1 on p.ID = g1.HOME_PARTICIPANT_ID join PLAY_OFF_GAME pl on g1.id = pl.GAME_ID where p.group_id = 441 and pl.GAME_ID is null
retun 0 rows
select * from PARTICIPANT p left join GAME g1 on p.ID = g1.HOME_PARTICIPANT_ID left join PLAY_OFF_GAME pl on g1.id = pl.GAME_ID where p.group_id = 441 and pl.GAME_ID is null
return 5
select * from PARTICIPANT p left join GAME g1 on p.ID = g1.HOME_PARTICIPANT_ID left join PLAY_OFF_GAME pl on g1.id = pl.GAME_ID where p.group_id = 441
return all participant 8 but also final game which I want to exclude

Answer 1

Your first query would select GAME rows that do not have a corresponding PLAY_OFF_GAME, but a join is probably much quicker:
SELECT *
FROM GAME g
LEFT JOIN PLAY_OFF_GAME pog ON g.ID=pog.GAME_ID
WHERE pog.GAME_ID IS NULL;
For the second question, you can do the same trick:
SELECT * FROM (
(SELECT p1.*, g.ID
FROM PARTIPANT p1
LEFT JOIN GAME g1 ON p1.ID=g1.HOME_PARTICIPANT_ID
LEFT JOIN PLAY_OFF_GAME pog1 ON g1.ID=pog1.GAME_ID
WHERE pog1.GAME_ID IS NULL)
UNION
(SELECT p2.*, NULL
FROM PARTICIPANT p2
JOIN GAME g2 ON p2.ID=g2.HOME_PARTICIPANT_ID
JOIN PLAY_OFF_GAME pog2 ON g2.ID=pog2.GAME_ID)) AS tmp;
Query may have typos. First selects Particpants in a game, or in no game, but it's excluding the participants only in final games. The second select fills those back in, ignoring the game.
Also:
To select all participants, and not just 'home' participants, not in a game or in a non-playoff game, add OR p.ID=g.AWAY_PARTICIPANT_ID to the ON clause. (I'm following your example, but the description seems to be at odds.
Should there be a foreign key constraint on PLAY_OFF_GAME? E.g., CONSTRAINT play_off_game_fk FOREIGN KEY (GAME_ID) REFERENCES GAME (ID)?