export all rows where modified dt field is > 01-jan-2010

export.sql

exports data that was modified(inc. created) after a certain date, in this case 01-oct-2011

uses analytic function to decide whether or not to add the column delimiter. in my case, i'm using || as a delimiter since my data contains tabs and commas

it generates /tmp/TABLE_NAME.cmd.sql and then executes it while spooling TABLE_NAME.txt.

usage:
$ sqlplus user/pass@db @export <TABLE_NAME> <MOD_DT_FIELD_NAME>

set echo off feedb off head off pages 0 lines 500 trimspool on verify off termout off array 1000
alter session set nls_date_format='YYYY-MM-DD HH24:MI:SS';
spool /tmp/&1..cmd.sql
prompt select
select lower(column_name)||case when column_id!=max(column_id) over (partition by table_name ) then ' || ''||'' ||' else null end col
from all_tab_columns
where table_name='&1'
order by column_id;
prompt from &1
prompt where &2 >= TO_DATE('01-OCT-2011','DD-MON-YYYY')
prompt /
spool off
spool &1..txt
@/tmp/&1..cmd.sql
spool off
exit