There's a further problem with databases: all database records are of a single, predefined type, and all instances of a record type are grouped together.
数据库还存在更多的问题，所有数据库记录有单一的预定义的类型，一种记录类型的所有实例被组织在一起。
There's a further problem with databases: all database records are of a single, predefined type, and all instances of a record type are grouped together.
数据库还存在更多的问题，所有数据库记录有单一的预定义的类型，一种记录类型的所有实例被组织在一起。
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