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This is only a partial answer but it worked for me from a JUnit test. I used SQL queries, not JPA. It's worth trying: <pre><code> Connection connection = getConnection(); SQLTemplates dialect = new PostgresTemplates(); // TODO: use appropriate db template QEventData c = new QEventData("c"); QEventData c2 = new QEventData("c2"); // Use this to hold alias for inner select PathBuilder<Object[]> c2alias = new PathBuilder<Object[]>(Object[].class, "c2alias"); SQLQuery query = new SQLQuery(connection , dialect); return query.from(c).innerJoin( new SQLSubQuery().from(c2) .groupBy(c2.deviceid) .list(c2.device, c2.timestamp.max().as("timestamp")), c2alias ).on(c.deviceid.eq(c2alias.get("deviceid")), c.timestamp.eq(c2alias.get("timestamp"))) .where(c.deviceid.in(1, 2)) .list(c.deviceid, c.timestamp); </code></pre> Note 1: In the list() function, you have to explicitly list the fields to select or you get an error I believe that is due to the use of the PathBuilder inner select alias. Note 2: Other posts indicate this may not work with JPA, just SQL: <a href="https://groups.google.com/forum/#!msg/querydsl/WDX6oB7Ivsg/0fzoLJA35lgJ" rel="nofollow">https://groups.google.com/forum/#!msg/querydsl/WDX6oB7Ivsg/0fzoLJA35lgJ</a> Note 3: In as much SQL as I have written, I have not seen the USING clause ever used in practice, for those who do not know it: <a href="http://docs.oracle.com/javadb/10.8.1.2/ref/rrefsqljusing.html" rel="nofollow">http://docs.oracle.com/javadb/10.8.1.2/ref/rrefsqljusing.html</a> Note 4: If the above does not work with querydsl/JPA, then consider refactoring the query to use an EXISTS clause.
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1. POHow to organise this query using QueryDsl
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Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.