An applicationdefined datatype (such as graphics and digitized voice) useful for storing large pieces of unformatted data in a database.; 一種由應(yīng)用軟件所定義的數(shù)據(jù)類型(如圖形和已數(shù)字化的話音),可用于在數(shù)據(jù)庫中存儲大 塊的無格式數(shù)據(jù)。