The relative articles in the database were sorted by different categories, such as "research categories", "publishing year" and "research drug".

对数据库中相关文献进行如“研究类型”、 “发表年代”、 “涉及药物”等分类项归类。

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Firstly, the tuples of database is divided into different groups and sorted to change a disordered state between tuples into a relative ordered state.

首先通过对数据库中的元组进行分组和排序，将元组之间的无序状态变为相对稳定的有序状态。

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