How to Select a Subset in MySQL. The Structured Query Language, used in the MySQL database, has great flexibility for selecting subsets of data from database tables. SQL's SELECT statement shows ...

A simple random sample is a subset of a statistical population where each member of the population is equally likely to be chosen.

What Is a Sample? Because it can be time-consuming and costly to study large groups, marketers, scientists, governments, and other researchers use smaller subsets or samples to make decisions that ...