判断题 The internal pattern of a database is independent of its global logical structure.()

判断题 The database is shared, so there should be no redundancy data in the database.( )

判断题 When the Patterns changes, change the image between patterns and external patterns accordingly so that the outer Patterns remains the same.( )

判断题 Database security is the protection of data to prevent illegal use caused by data leakage, change or damage.( )

判断题 If A is the primary property of relation R, then property A can't be NULL.( )

判断题 Transaction consistency means that all operations included in a transaction either do or do not do all.( )

判断题 In order to ensure that the database can be recovered, you must first write the database, and then write log files.( )

判断题 Database security is the protection of data to prevent illegal use caused by data leakage, change or damage.( )