-- export specific column data to text file:

copy EMPLOYEE( EMP_NAME,EMP_ID) to '/tmp/emp.txt';

-- export complete table data to text file:

copy EMPLOYEE to '/tmp/emp.txt';

-- export table data to csv file:

copy EMPLOYEE to '/tmp/emp.csv' with csv headers;

-- export specific query output to csv file:

copy ( select ename,depname from emp where depname='HR') to '/tmp/emp.csv' with csv headers;