Exp & Query option causing EXP-00056 ORA-00904

Question

Experts,
Database Version: 9.2.0.4.0
I'm trying to export with using query option, But having below errors.
Any suggestions Please.
exp system/***** tables=ORDERS_TN file=ORDERS_TN.dmp log=ORDERS_TN.log query=\" WHERE ORDERS_ID IN \('A1','A201','A3'\) \"
Export: Release 9.2.0.4.0 - Production on Wed Feb 1 21:42:02 2012
Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.
Connected to: Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.4.0 - Production
Export done in WE8ISO8859P1 character set and AL16UTF16 NCHAR character set
About to export specified tables via Conventional Path ...
. . exporting table                     ORDERS_TN
EXP-00056: ORACLE error 904 encountered
ORA-00904: "A3": invalid identifier
Export terminated successfully with warnings.Thanks.

Answer 1

Hello,
The preferred way to use the query option is to use it in the parfile, because the query option may have special characters within its values which need to be escaped and every OS has its own way of escaping those characters. So in order to make it portable and easy, create a file parfile and use that in the export command.
For example create a file myval.txt and put following query in it:
query="WHERE ORDERS_ID IN ('A1','A201','A3')"
and then use export command as:
exp system/***** tables=ORDERS_TN file=ORDERS_TN.dmp log=ORDERS_TN.log parfile=myval.txt
regards
Fahd