How to Spool the data in SQL developer tool

set SERVEROUTPUT ON SIZE 1000000

 set headsep off

set pagesize 0

set trimspool on

set lines 240

spool E:\prebill.csv

select trx_number, trx_date from ra_customer_trx_all where trunc(trx_date) between trunc(sysdate-1) and trunc(sysdate);

spool off;

Note:-  Select all the script and press F5, it will generate the output in E Drive with file name as prebill.csv