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mysql structure

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Last Modified: 2014-03-12
Hello,
I have this mysql structure that its working fine for me and very simple..
I would like to know if its possible to create something so that it doesn't allow duplicates on (itockSymbol with iwhen) which is a timestamp

for example there is an insert USD and 1394647007306
and again another insert insert USD and 1394647007306 but dont allow it as it is a dup.
but if its AUD and 1394647007306 then its okay.
how can I do this?

CREATE TABLE IF NOT EXISTS `EURJPY` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `itockSymbol` varchar(40) DEFAULT NULL,
  `iwhen` varchar(20) DEFAULT NULL,
  `ibuyValue` varchar(20) DEFAULT NULL,
  `isellValue` varchar(20) DEFAULT NULL,
  PRIMARY KEY (`id`)
)  ;

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