14.7. 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(...), sum(...), min(...), max(...)
-
count(*)
-
count(...), count(distinct ...), count(all...)
You may use arithmetic operators, concatenation, and recognized SQL functions in the select clause:
select cat.weight + sum(kitten.weight)
from Cat cat
join cat.kittens kitten
group by cat.id, cat.weight
select 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