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postgreSQL SELECT data into file

You can COPY table and paste it into a file.

postgres=# select * from my_table;
 c1 | c2 | c3
 1 | 1 | 1
 2 | 2 | 2
 3 | 3 | 3
 4 | 4 | 4
 5 | 5 |
(5 rows)
postgres=# copy my_table to '/home/postgres/my_table.txt' using delimiters '|' with null as
'null_string' csv header;
postgres=# \! cat my_table.txt


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