Sample Control file + sqlldr

SQLLDR USERID=account_data/account_data@test CONTROL=D:\share\vivek\test.CTL ERRORS=5000 log=d:\abc.log

test.CTL=
load data
infile 'data_daily1.csv'
infile 'data_daily2.csv'
infile 'data_daily3.csv'
append
into table daily_upload
fields terminated by ","
optionally enclosed by '"'
trailing nullcols
(
col1,
col2,
col3,
col4,
col5
)