关系数据库由一组表组成,包含一组记录或行。
A relational database comprises a set of tables, containing a set of records or rows.
BREAK命令可用于基于特定列值将报表分成一组记录。
The break command can be used to break the report into a set of records based on a particular column value.
preview项现在向您展示了界面的外观(一组记录是怎样在运行时显示在界面上的)。
The Preview TAB now shows you what your screens will look like (how a group of records might be displayed on a screen at run time).
A cohort study means you take the same group of people and follow them every five years for that period of time.
定群研究意味着你只有一组研究对象,然后在研究期间每五年进行一次记录数据
Well, a cross-sectional study would mean that you'd get a random group of the population and measure them in 1970 and then take another random group five years later and measure them, but it wouldn't be the same people necessarily, it would be different groups of people.
那么,横断面研究就是,1970年你在人群中随意选择一组人,并记录下相关数据,然后,五年后再随意选择一组人记录数据,但这不需要是同一组人,通常是不同的人
应用推荐