| 摘要 |
A method for retrieving information from a database system includes the use of: a data query comprising a specification of information to be retrieved from the database system; a first parameter specifying a condition to be met by retrieved information; and a second parameter specifying one or more data reduction operations, such as aggregating, sampling or filtering, to be executed if the condition defined by the first parameter is not met. Preferably the first and second parameters are integrated into the data query in a database query language |
