To ignore duplicate keys during 'copy from' in postgresql

Question

I have to dump large amount of data from file to a table PostgreSQL. I know it does not support \'Ignore\' \'replace\' etc as done in MySql. Almost all posts regarding this

Answer 1

PostgreSQL 9.5 now has upsert functionality. You can follow Igor's instructions, except that final INSERT includes the clause ON CONFLICT DO NOTHING.

INSERT INTO main_table
SELECT *
FROM tmp_table
ON CONFLICT DO NOTHING