System functions include data querying data, maintaining database, printing, backuping and restoring database, users management.
系统功能包括数据查询、数据库数据维护、打印、备份和恢复、用户管理；
An approach to approximate querying of general graph structured semistructured data is proposed based on a relational database system.
提出一种利用关系数据库系统在一般图结构的半结构化数据上进行近似查询的途径。
Highly efficient and fast functions of welding material information data increasing, deleting, editing and querying are provided in this database system.
该数据库具有高效、快速的焊接材料信息数据增加、删除、编辑和查询的功能。
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