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create table events ( id serial primary key, a uuid DEFAULT uuid_generate_v4(), b int, constraint no_screening_time_overlap exclude using btree ( a WITH =, b WITH = ) ); insert into events (a, b) values (1, 1); insert into events (a, b) values (1, 2); insert into events (a, b) values (2, 1); insert into events (a, b) values (2, 2); insert into events (a, b) values (1, 1);

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