Inthisarticle,wewilllookintocreatingourownAggregateFunctioninOracle.User-definedaggregatesareafeatureoftheExtensibilityFramework.ItispossbiletomakeuserdefineAggregatefunctionbecauseofOracle'sDataCartridgemodelwhichtakesadvantageofobjecttypesandotherextensibilityfeatures.Inorderto