If the tables are small or if the frequency of queries that would make use of the functional index is small, then you may not benefit from creating a functional index.
如果表非常小，或者不经常执行使用函数索引的查询，那么创建函数索引可能收效甚微。
Running jobs at regular intervals is managed by the cron facility, which consists of the crond daemon and a set of tables describing what work is to be done and with what frequency.
以一定的时间间隔运行作业需要使用cron设施进行管理，它由crond守护进程和一组表(描述执行哪些操作和采用什么样的频率)组成。
By exploratory statistic analysis, the paper gave bivariate frequency contingency tables between every qualitative variable and every publishing company.
通过探索性统计分析，给出了调查报告中各定性变量和出版社间的二向频率列联表。
The difficulties of computer algorithm of designed tide level are looking up and counting the relevant tables and drawing the frequency curves.
设计潮位的计算机算法，其难点是有关的表格查算和绘制频率曲线图。
The difficulties of computer algorithm of designed tide level are looking up and counting the relevant tables and drawing the frequency curves.
设计潮位的计算机算法，其难点是有关的表格查算和绘制频率曲线图。
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