Automatic column grouping for databases < SQL99 ----------------------------------------------- Key: HHH-1002 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1002 Project: Hibernate Core Issue Type: Improvement Affects Versions: 3.0.5 Environment: Hibernate 3.0.5, PostgreSQL 8.0 Reporter: Oliver Siegmar The 4th example at http://www.hibernate.org/hib_docs/v3/reference/en/html/queryhql.html#quer... won't work with PostgreSQL. PostgreSQL throws an exception, because all non-aggregate selected columns have to be grouped - not only the unique (primary) identifier. Hibernate's behaviour requires a SQL99 compliant database with support for "functional dependencies". PostgreSQL only complies with the SQL92 standard. Surely a workaround would be to add all non-aggregate fields to the group by clause, manually, but this would require manually hql updates each time the databean gets modidfied (by a new field, for e.g.). Especially for bigger reports, the group by clause gets huge and error prone. Would it be possible to manage the group by clause automatically - depending on if the used database is SQL99 compliant or not?