I found the answer
organization external
(
type oracle_loader
default directory ext_tab_dir
access parameters (
records delimited by '\r\n'
characterset 'utf8'
badfile 'SOD_RULE_SET_bad.txt'
logfile 'SOD_RULE_SET_log.txt'
skip 1
fields terminated by ',' Optionally Enclosed by '"'
missing field values are null
reject rows with all null fields
)
location ('SOD_RULE_SET.csv')