For example, you might run a daily report that shows the change in data from yesterday. You can compare the individual rows of table data or find intersections or unions of sets of rows.

例如，你可能需要生成一份前一天数据更新的日报告，你可以分别比较表的每一行或找到行的交集和并集。

youdao

However, we now live in a time when there are video cameras at stop-light intersections, drones that patrol war zones, my iPhone can even find itself, so there has to be a better way to monitor felons (inmates) without having them housed on sprawling government complexes and on the government payroll.

FORBES: Here's an Idea To Reduce The Deficit - Release Some Federal Inmates