Abstract: A method and/or system of partially updating data in a data collection including determining, in a first incoming row of an incoming update file, whether a first incoming column contains new data, and in response using the new data in a first updated column of a first updated row in an updated master file; and in response to the first incoming column of the incoming update file not containing new data, determining whether a first master column in a first master row of the master table contains old data; and in response using the old data in the first updated column of the first updated row in the updated master file.