对数据库运算有很多并行算法。

There are a lot of investigating on parallel algorithms in database.

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这个方法可以利用关系数据库运算实现，而且不要求预先指定类数。

This method can be implemented by the calculation of the relational data base, and it is not necessary to fix Numbers of classes in advance.

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大部分数据库系统支持时间戳运算。

Most database systems support timestamp arithmetics.

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