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Error with single quotes during export

I want to export a table based on condition that could be provided in the WHERE clause in the export command. The condition on which the clause is built has a field that is of the string type, so we need to provide the string in single quotes but the export is not allowing me to perform the same. HEre is the command (Oracle Version 8.1.7 on Win2k box):
 EXP USERID = userid/userid TABLES='temp_table' LOG='temp_table.LOG'

 FILE='temp_table.DMP' QUERY= "where some_FLAG='YES'"
It is giving me this error:
 LRM-00101: unknown parameter name 'some_FLAG' 
 EXP-00019: failed to process parameters, type 'EXP HELP=Y' for help
 EXP-00000: Export terminated unsuccessfully

Try escaping the quote and double quote marks.
 QUERY= \"where some_FLAG=\'YES\'\"

This was last published in August 2004

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