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Источник: http://axmas.blogspot.com/2007/07/valueemptystring.html
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If you want to query the empty (“ ”) value in queryBuildRange, you have to use valueEmptyString.

myOdrTrkQBR1.value(myOrdTracking.avOrderStatus ? myOrdTracking.avOrderStatus : sysQuery::valueEmptyString());

Источник: http://axmas.blogspot.com/2007/07/valueemptystring.html