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Developer-C 11.1
3.0
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create table t (id int, user_id int, project_id int); insert into t values (17373, 6336, 1001), (17374, 6336, 1001), (17375, 6336, 1001), (529044, 6336, 1001), (17305, 6342, 1003), (17350, 6318, 1003), (17388, 6318, 1003), (811062, 6342, 1003), (811063, 6342, 1003), (1552793, 6342, 1003);
select distinct user_id, project_id from t where project_id in (select project_id from t group by project_id having count(distinct user_id) > 1);
user_id
project_id
6342
1003
6318
1003