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Hi, can you help me please, i have to build a query and i have a problem in the group by expression ==> error message: not a group by expression my query: select ress.nom nom_ress, task.nom tache, max(tr.entrydate), ass.prstart, ass.prfinish, nvl(ass.practsum,0) service_fait, nvl(ass.prestsum,0) service_à_faire, prj.nom projet, tr.resource_class, tr.transclass, tr.project_department from … 
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