First, include in the index all the columns in the WHERE clause, so that index screening can be used to reject unqualified rows from the result set.

首先，在索引中包括WHERE子句中的所有列，这样，就可以使用索引形成的屏蔽来拒绝结果集中不合格的行。

A screening of MMPI to Qigong practitioners should be carried out to reject the susceptible population.

为减少练功出偏的发生，可采用MMPI在练功人群中进行筛查，以剔除易感人群。