例句與造句

1. There are two types of data independence : Physical data independence and logical data independence.
2. There are two levels of data independence, they are Physical data independence and Logical data independence.
3. Logical data independence is more difficult to achieve than physical data independence, since application programs are heavily dependent on the logical structure of the data that they access.
4. While many systems built on SQL fail miserably with respect to Codd's rule 9 " Logical data independence ", Dataphor applications can automatically change when the logical layer change.
5. No mainstream DBMS systems are fully based on it ( they tend not to exhibit full physical independence or to prevent direct user access to the conceptual level ), but the idea of logical data independence is widely adopted.
6. It's difficult to find logical data independence in a sentence. 用logical data independence造句挺難的