HQL: How to select all entities distinct by some column?

Question

A simple question:
In this example I need to retrieve all objects, but these objects must have distinct msgFrom fields.
When I use

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Answer 1

Below is the sample query :

select e from Message e 
where e.msgFrom IN (select distinct m.msgFrom 
                      from Message m
                      WHERE m.msgTo = ? 
                      AND m.msgCheck = "0");

Alternatively, you can also use Criteria API.