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上海墓地，墓地价格

怎么查询某公司使用的操作系统和数据库系统，

the dbms translates a dml statement into aprocedure that manipulates the required set of records.– this frees the user from having to know how datastructures are internally implemented and whatalgorithms are required to retrieve and possiblytransform the data, thus providing users with aconsiderable degree of data independence.– relational dbmss usually include some form of nonprocedurallanguage for data manipulation.我们老师讲的non-procedural dml: a language that allowsthe user to state what data is needed ratherthan 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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