SQL

psql to csv

-- Client side -This approach does the file handling on the client side
Copy (Select * From foo) To '/tmp/test.csv' With CSV DELIMITER ',' HEADER

-- Server side - This approach runs entirely on the remote server
Copy (Select * From foo) To '/tmp/test.csv' With CSV DELIMITER ',' HEADER;

csv into data postgres

COPY table_name FROM 'C:UsersPublicDocumentsert.txt' DELIMITER ',' CSV
-- make sure to put the file in public folder in windows 
-- Or temp folder in linux/mac 
-- because it might ask for some permissions...

postgresql import data from csv

copy table from '/home/usama/Documents/columns_rearrange.csv' csv header ;

Import CSV to PostgreSQL

COPY mytable FROM '/path/to/csv/file' WITH CSV HEADER; -- must be superuser