今天在做统计功能的时候遇到这样一个问题，由于查询结果为统计的数据，即使用了sum方法生成的字段，
select refDate,sum(triggerCount) as triggerCount,sum(case when unique_key is null then 0 else trigger_count end) as hitCount from TriggerStatistic where user=:user and type=:type and refDate >=:fromDate and refDate <=:toDate group by refDate order by hitCount asc
会提示 TriggerStatistic不存在 hitCount 属性
于是使用查询的列序号进行排序
查询的列有
1:refDate
2:triggerCount
3:hitCount
要对hitCount这一列进行排序 只要使用 order by 3 asc/desc
于是改为:
select refDate as refDate,sum(triggerCount) as triggerCount,sum(case when unique_key is null then 0 else trigger_count end) as hitCount from TriggerStatistic where user=:user and type=:type and refDate >=:fromDate and refDate <=:toDate group by refDate order by 3 asc
原文：http://www.cnblogs.com/rubekid/p/4604363.html