postgresql7.3 select coalesce(sum(round((ese.grade*et.weight*eg.weight)/10000,2)),0) as grade from evaluation_grades eg, evaluation_tasks et, evaluation_student_evals ese, acs_objects ao, cr_items cri1, cr_items cri2, cr_items cri3 where et.task_item_id = ese.task_item_id and et.grade_item_id = eg.grade_item_id and eg.grade_item_id = ao.object_id and ao.context_id = :package_id and ese.party_id = ( select CASE WHEN et3.number_of_members = 1 THEN :user_id ELSE (select etg2.group_id from evaluation_task_groups etg2, evaluation_tasks et2, acs_rels map where map.object_id_one = etg2.group_id and map.object_id_two = :user_id and etg2.task_item_id = et2.task_item_id and et2.task_id = et.task_id) END as nom from evaluation_tasks et3 where et3.task_id = et.task_id ) and cri1.live_revision = eg.grade_id and cri2.live_revision = et.task_id and cri3.live_revision = ese.evaluation_id -- select evaluation__class_total_grade(:user_id,:package_id)