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create table orders ( offerId varchar(2), users varchar(2), create_date date, finish_date date, Mark varchar(2) ); insert into orders (offerId, users, create_date, finish_date,Mark) values ('1a', 'u1', '2020-01-01', '2020-01-02', 'M1'), ('2b', 'u1', '2020-01-03', '2020-01-04', 'M2'), ('3x', 'u1', '2020-01-05', '2020-01-07', 'M1'), ('12', 'u1', '2020-03-04', '2020-03-08', 'M4'), ('4y', 'u1', '2020-03-01', '2020-03-10', 'M4'), ('5z', 'u2', '2020-04-01', '2020-04-05', 'M1'), ('6f', 'u2', '2020-04-06', '2020-04-07', 'M2'), ('7f', 'u2', '2020-04-10', '2020-04-11', 'M4'), ('8f', 'u2', '2020-07-01', '2020-07-09', 'M2'), ('9', 'u3', '2020-08-01', '2020-08-10', 'M2'), ('10', 'u3', '2020-08-03', '2020-08-10', 'M3'), ('11', 'u3', '2020-08-03', '2020-08-10', 'M4'); SELECT DISTINCT users FROM orders WHERE EXISTS ( SELECT DISTINCT Mark FROM orders WHERE users = 'u2') AND users <> 'u2';

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