为了获取在大容量表中查询的合理的响应时间，最好为某列或者列组合定义索引。
To get reasonable response times for queries on large tables, it is a best practice to define indexes for certain columns or combination of columns.
结果实施心理健康教育活动课程后干预班和对照班在MHT3项内容量表上评分差异有显著意义；
Results After intervention, there were significant differences between the intervention group and the control group in 3 items in MHT.
结果实施心理健康教育活动课程后干预班和对照班在MHT3项内容量表上评分差异有显著意义；
Results After intervention, there were significant differences between the intervention group and the control group in 3 items in MHT.
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