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CREATE TABLE tokens (
user_id int,
regions int[]
);
insert into tokens values (5, array[1,2,3]);
CREATE TABLE regions (
id int,
ru_name varchar(64)
);
insert into regions values (1, 'Region 1'), (2, 'Region 2'),(3, 'Region 3');
with reg_ids as (
select unnest(regions) reg_id
from tokens where user_id = 5
) select regions.*
from reg_ids
join regions on regions.id = reg_id;
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