21 lines
640 B
SQL
21 lines
640 B
SQL
ALTER TABLE player_stats
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ADD COLUMN rating REAL NOT NULL DEFAULT 1000.0;
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CREATE TRIGGER update_player_rating
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AFTER UPDATE OF games_played, games_won ON player_stats
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WHEN NEW.games_played = OLD.games_played + 1
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BEGIN
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UPDATE player_stats
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SET rating = OLD.rating +
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32.0 * (
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CASE
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WHEN NEW.games_won = OLD.games_won + 1
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THEN 1.0 - 0.5 -- Win term: 0.5
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ELSE 0.0 - 0.5 -- Loss term: -0.5
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END
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) +
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0.05 * (1000.0 - OLD.rating)
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WHERE id = OLD.id;
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END;
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