Therefore, when age is presented in some form of output (report or Web page), it was calculated rather than extracted from the database.
因而，当一些输出表(报表或web页面)中显示了Age时，它应该是计算出来的，而不是从数据库中提取出来的。
By using related database technique, historic database is created automatically in order to realize the historic data inquiry in the form of historic curve and data report.
利用相关数据库知识，自动生成了历史数据库，以历史曲线和数据报表的形式完成了历史数据查询。
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