A logical sub-division of a data base that contains all occurrences of stipulated data aggregates.
A logical sub-division of a data base that contains all occurrences of stipulated data aggregates.
数据库中的一种逻辑子域，它包含了有约定的数据的聚集的全部（具体）值。
A logical sub-division of a data base that contains all occurrences of stipulated data aggregates.
数据库中的一种逻辑子域，它包含了有约定的数据的聚集的全部（具体）值。