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CREATE TABLE users( id INT PRIMARY KEY AUTO_INCREMENT, name VARCHAR(255) ); INSERT INTO users (name) VALUES ("Gregor"), ("Liza"), ("Matt"), ("Bob"); CREATE TABLE committee( user_id INT, friend_id INT, member_id INT, PRIMARY KEY (`user_id`, `friend_id`, `member_id`), FOREIGN KEY (`user_id`) REFERENCES `users` (`id`), FOREIGN KEY (`friend_id`) REFERENCES `users` (`id`), FOREIGN KEY (`member_id`) REFERENCES `users` (`id`) ); INSERT INTO committee (user_id, friend_id, member_id) VALUES (1, 2, 3), (1, 2, 4); CREATE TABLE tokens( user_id INT, token VARCHAR(255) ); INSERT INTO tokens (user_id, token) VALUES (1, "lclasld2"), (2, "xxkakdasd"), (3, "123kdkfs"), (4, "hjj32");
SELECT user_id, token FROM tokens WHERE user_id IN (SELECT friend_id FROM committee WHERE user_id = 1 UNION SELECT member_id FROM committee WHERE user_id = 1)
user_id
token
2
xxkakdasd
3
123kdkfs
4
hjj32