数据库运算_有道手机词典

1.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.
dict.yoduao.com
2.大部分数据库系统支持时间戳运算。
Most database systems support timestamp arithmetics.
dict.yoduao.com
3.为了获得这些数据，您可能需要调用 Web 服务、连接到数据库、执行复杂的逻辑运算或从多个数据源汇总数据。
To obtain this information, you may invoke a Web service, connect to a database, perform complex logic, or aggregate data from multiple sources.
dict.yoduao.com