data structure independence

基本解释

It especially made the independence between data accessing structure and data logical structure possible in the database design process.
特別是在數據庫設計過程中，實現使數據存儲結搆與數據邏輯結搆的變化獨立開來。
Program-data independence:It is a property of database system that the structure of data file is stored in the DBMS catalog separately from the access programs.
數據庫目錄包含每個文件的結搆，每條數據項的類型和存儲格式，以及針對數據的不同約束等信息。
In order to keep the data independence from application program, the necessary local logical data structure can be self-defined in every individual application program.
爲了實現數據對應用程序的獨立性，應用程序自行定義所需要的侷部邏輯數據結搆。