Postgres import/export table from/to CSV file
copy tablename to '/csv.txt' delimiter ',' csv header;
copy (select * from tablename) to '/csv.txt' delimiter ',' csv header;
copy tablename from '/csv.txt' delimiter ',' csv header;
copy (select * from tablename) to '/csv.txt' delimiter ',' csv header;
copy tablename from '/csv.txt' delimiter ',' csv header;
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