请给出至少两种理由说明为什么数据库系统使用声明性查询语言，如SQL，而不是提供C或者C++的函数库来操作数
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The DBMS translates a DML statement into a
procedure that manipulates the required set of records.
– This frees the user from having to know how data
structures are internally implemented and what
algorithms are required to retrieve and possibly
transform the data, thus providing users with a
considerable degree of data independence.
– Relational DBMSs usually include some form of nonprocedural
language for data manipulation.
我们老师讲的Non-procedural DML: A language that allows
the user to state what data is needed rather
than how it is to be retrieved.应该差不多.你把前面的改改看看行不行
procedure that manipulates the required set of records.
– This frees the user from having to know how data
structures are internally implemented and what
algorithms are required to retrieve and possibly
transform the data, thus providing users with a
considerable degree of data independence.
– Relational DBMSs usually include some form of nonprocedural
language for data manipulation.
我们老师讲的Non-procedural DML: A language that allows
the user to state what data is needed rather
than how it is to be retrieved.应该差不多.你把前面的改改看看行不行
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