Sub OQL Query Error

Hi All,

Can we use sub oql query in mendix 6. Below is example of query where i am getting error

select subOqlQuery.c1,sum(subOqlQuery.c2) from (select min(column1) over (partition by (column2) as c1, coulmn3 as c2 from module.table) as subOqlQuery group by subOqlQuery.c1

Please suggest its urgent?