If I have a group by query
Select e.field1, e.field2...
from Entity w
group by e.field1, e.field2...
How can I count the number of rows not using NativeQuery? I need to do something like this:
select count(*) from
(Select e.field1, e.field2...
from Entity w
group by e.field1, e.field2...)
Is there any way to do with JPQL?
Derived tables are not supported in JPQL, so, the best way to do it is to run a native SQL query.
After all, there is a very good reason why both JPA and Hibernate offer support for SQL queries , don't you agree?
in oracle you can this hql
Select sum(count(*) - count(*) + 1)
from Entity e
group by e.field1, e.field2...
but dose not work in postgres
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