a question of sqlldr

there is a table  tmp(a varchar2(3),b varchar2(3),rmk varchar2(6))

the content of tmp.txt  is:  
a|a
b|b

the content of tmp.ctl  is:
LOAD DATA
        INFILE 'tmp.txt'
        INTO TABLE tmp append
        FIELDS TERMINATED BY '|'
        (sn,
         agent,
         rmk "to_char(sysdate,'yyyymm')")

Run "sqlldr ltj/intelL control=tmp log=log.txt " ,then show :

“SQL string for column : "to_char(sysdate,'yyyymm')"

Record 1: Rejected - Error on table TMP, column RMK.
Column not found before end of logical record (use TRAILING NULLCOLS)”

why??
tjliAsked:
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catchmeifuwantCommented:
Use trailing nullcols in your control file...

LOAD DATA
INFILE 'tmp.txt'
INTO TABLE tmp append
FIELDS TERMINATED BY '|'
trailing nullcols
(a,b,rmk "to_char(sysdate,'yyyymm')")
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Vinay_dbaCommented:
SQL loader is expecting data as a|a|a. If last column/columns is null you have to use trailing nullcols.
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