Database versioning with output only of data changed from the previous version

摘要

A method and system for extracting revenue information from a point-of-sale (POS) terminal for purposes of revenue sharing including the step of periodically selecting and extracting predetermined portions of revenue transaction data in a proprietary database. This system allows extrapolation of select data relating to revenue traffic in a rental system. Revenue stored in a proprietary database (40) by a proprietary point-of-sale operating program is periodically selected, extracted and stored in a periodic database (42). This data is compared to a history database (38) comprising the periodic database as it existed prior to a given time. The data is output from the periodic database that is not present in the history database at the given time. This data can be transmitted to a remote location. The proprietary point-of-sale operating program can be used to create a history report database from the revenue transaction data and the portions of the revenue transaction data can be selected and extracted from the history report database.