I want to export a column in a table like (column ename in emp table) and import it later. I have faced a situation where I had to export only four colunms in a table containing 20 columns.

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Oracle's export utility will export all columns of a table. You cannot use exp or 10g's new Data Pump, expdp, to export only specific columns of a table. If you want to export just one column of data from a table, then I would recommend simply using SQL*Plus and spooling the output to a file, similar to the following: 
spool emp_ename.txt
SELECT ename FROM scott.emp;
spool off
With the above commands in SQL*Plus, you will have a text file containing the output of just the ENAME column of the SCOTT.EMP table.

This was first published in September 2005

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