休眠，如何根据条件进行计数 [英] Hibernate, how to count with condition

问题描述

我正在使用oracle和hibernate进行映射.我想用count()函数中的条件来计数.我的代码是:

I am using oracle and hibernate for mapping. I want to count with a condition in count() function. my code is:

select count(case when st.averageMark < su.gradePass then 1 else 0 end)
from Study st join st.subject su
 where st.acaYear in (2009)
  and st.semester = 4
  and su.idSeq = 1330
group by st.acaYear

代码什么也没给我.我使用sum而不是count来返回结果，但这是错误的，结果比我想象的要大.

the code return me nothing. I used sum instead of count it returned a result but it is wrong, the result is bigger than I suppose it to be.

先谢谢.

推荐答案

我刚刚使用以下代码解决了问题.

I just solved the problem with the following code.

select sum(case when st.averageMark >= su.gradePass then 1 else 0 end) as pass,
       sum(case when  st.averageMark < su.gradePass then 1 else 0 end) as fail
from Study st join st.subject su
where st.acaYear in (2009) and st.semester = 4 and su.idSeq = 1330
group by st.acaYear

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