OPERATION OF DATA BASE SYSTEM

摘要

PURPOSE: To update data by one pass by executing reference restriction concern ing each record before another record is operated in a relational database control system. CONSTITUTION: Reference restriction concerning each record is executed before another record is operated by the same operation at the time of operating operation such as data update which can exert influence on plural records in the relational database control system. Consequently, though twice passes are necessitated for data operation and restriction execution at the time of updating data before, restriction is executed in one body with data updating operation to effectively execute reference restriction in a relational database.