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CREATE TABLE user_team (id INT, team INT); INSERT INTO user_team VALUES (1, 1), (2, 2), (3, 2), (4, 3); SELECT * FROM user_team;
id
team
1
1
2
2
3
2
4
3
SELECT *, COUNT(*) OVER (PARTITION BY team) users_in_team FROM user_team;
id
team
users_in_team
1
1
1
2
2
2
3
2
2
4
3
1