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CREATE TABLE memorization_word_translation ( from_word_id INTEGER, to_word_id INTEGER ); INSERT INTO memorization_word_translation (from_word_id, to_word_id) VALUES ('35', '36'), ('35', '37'), ('36', '35'), ('37', '35'), ('37', '39'), ('39', '37');
6 rows affected
select from_word_id, to_word_id from ( select *, row_number() over ( partition by least(from_word_id, to_word_id), greatest(from_word_id, to_word_id) order by (from_word_id > to_word_id)::int ) rn from memorization_word_translation where 35 in (from_word_id, to_word_id) ) t where rn = 1
from_word_id
to_word_id
35
36
35
37