id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	rating	NULL	index_merge	fk_rating_player_id,fk_rating_tournament	fk_rating_tournament,fk_rating_player_id	5,4	NULL	1	100	Using intersect(fk_rating_tournament,fk_rating_player_id); Using where