Red Hat Summit8.5. Aggregate functions
HQL queries may even return the results of aggregate functions on properties:
select avg(cat.weight), sum(cat.weight), max(cat.weight), count(cat) from Cat cat
The supported aggregate functions are
avg(...), avg(distinct ...), sum(...), sum(distinct ...), min(...), max(...)count(*)count(...), count(distinct ...), count(all...)
You may use arithmetic operators, concatenation, and recognized SQL functions in the select clause (depending on configured dialect, HQL specific feature):
select cat.weight + sum(kitten.weight)
from Cat cat
join cat.kittens kitten
group by cat.id, cat.weightselect firstName||' '||initial||' '||upper(lastName) from Person
The
distinct and all keywords may be used and have the same semantics as in SQL.
select distinct cat.name from Cat cat select count(distinct cat.name), count(cat) from Cat cat
