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WITH RankedDuplicates AS ( SELECT *, ROW_NUMBER() OVER (PARTITION BY unique_column ORDER BY id) AS rn FROM table_name ) DELETE FROM RankedDuplicates WHERE rn > 1; -- Оставляем только одну строку из каждой группы дубликатов [2](https://sky.pro/wiki/sql/udalenie-dublikatov-strok-v-postgre-sql-sql-komanda/)

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