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create table tbl (
id serial,
user_login text,
device text,
issued_at timestamp
);
insert into tbl (user_login, device, issued_at) values
('ivanov', 'dev1', '2023-01-01'),
('ivanov', 'dev2', '2023-02-01'),
('petrov', 'dev3', '2023-03-01'),
('petrov', 'dev1', '2023-01-01'),
('sidorov', 'dev4', '2023-02-01');
with d as (
select
*,
row_number() over (partition by user_login order by issued_at) rn
from tbl
) select * from d where rn = 1;
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