Loading only interested columns to table

Question

Hi,
I created an external table that includes all of the columns in the data file. I want to load only interested columns to external table instead of all of them. I looked at OTN documents, i saw position of columns can be choosen. But i want for example, load 2,56,67 columns of data file to external table.
Example data file is :
12,23,4324,32,1,DSA,23F,DSF32,FD,32DF
112,23,432H4,3HJ2,1HR,DRSA,23F,D4SF32,FD,323DF
125,Y23,46324,32MM,1H,DSA,2R3F,D3SF32,F2D,312DF
External table should be :
ID ( first col of datafile ) NAME ( 7th col of datafile ) LOCATION ( 8 th col of datafile )
12 23F DSF32
112 23F D4SF32
125 2R3F D3SF32
How can i perform this? Can you suggest any tactic or clue to do this?
Thanks for responses.

Answer 1

Hello,
Thanks for fast response. But i have a question. I have not tried yet but i am wondering, what the means of POSITION ( 1:4), POSITION ( 6:25), why you didnt use this clause in the other column specification? Can you explain in detailly ? Also, i had not mentioned that column lengths in datafile are not fixed, for example in 1. line first column's length is 8, 2.line first column's length is 20. Can you example handle this situation?
POSITION is for fixed data length and in this example I just wanted to load only 2 fields so I specifed POSITION for only 2 fields. Now in your case data is not fixed length, then using POSITION wont' help and result in error or ambigous dataload. So we will be using variable length but data should not be bigger than table column data length
Other option is to use sqlldr where you have choice of usign FILLER if you want to skip a column.
#emp.dat
1232,AAA,OOOOOOOOOOOOOOOOOOOO,AB
12,23232232323232323,232,B
DROP TABLE ext_tab PURGE;
CREATE TABLE ext_tab (
   empno CHAR (4),
   ename CHAR (20),
   job CHAR (20),
   deptno CHAR (2)
ORGANIZATION EXTERNAL
   ( TYPE oracle_loader DEFAULT DIRECTORY EXPORT_DIR ACCESS PARAMETERS (
   RECORDS DELIMITED BY NEWLINE BADFILE 'bad_%a_%p.bad' LOGFILE
   'log_%a_%p.log' FIELDS TERMINATED BY ',' MISSING FIELD VALUES ARE NULL
   REJECT ROWS WITH ALL NULL FIELDS ( empno  , ENAME ,
    job, deptno  ) ) LOCATION ( 'emp.dat' ) );
SELECT *
FROM ext_tabRegards