I would like to share 2 tips: (tip 1) create a csv file  (tip 2) Load rows from a csv file into a table.
====[ (tip 1) SQLPLUS to create a csv file form an Oracle table ]====
I use SQLPLUS with the following commands:
set markup csv on
set lines 1000
set pagesize 100000 linesize 1000
set feedback off 
set trimspool on
spool /MyFolderAndFilename.csv
Select *  from MYschema.MYTABLE  where MyWhereConditions ;
spool off
exit
====[tip 2 SQLLDR to load a csv file into a table ]====
I use SQLLDR and a csv ( comma separated ) file to add (APPEND) rows form the csv file to a table.
the file has  ,  between fields text fields have " before and after the text
CRITICAL: if last column is null there is a ,  at the end of the line
Example of data lines in the csv file:
11,"aa",1001
22,"bb',2002
33,"cc",
44,"dd",4004
55,"ee',
This is the control file:
LOAD DATA
APPEND 
INTO TABLE MYSCHEMA.MYTABLE
fields terminated by ',' optionally enclosed by '"'
TRAILING NULLCOLS
(
CoulmnName1,
CoulmnName2,
CoulmnName3
)
This is the command to execute sqlldr in Linux. If you run in Windows use \ instead of / c:
sqlldr userid=MyOracleUser/MyOraclePassword@MyOracleServerIPaddress:port/MyOracleSIDorService  DATA=datafile.csv  CONTROL=controlfile.ctl  LOG=logfile.log  BAD=notloadedrows.bad
Good luck !