HQL：如何通过ID在子集合中查找项目

Question

I'm trying to find the number of Events that have a given Cluster as member. I have the cluster id. (Event to Cluster is a ManyToMany.)

I have an HQL query like this:

select count(*) from Event e join e.clusters c where :id in (c.id)

I've also tried to put a subselect in the "in" part, but no luck.

Is there a way to do this in HQL?

Answer 1

select count(distinct e.id) 
from Event e join e.clusters c 
where c.id = :id