$sql="SELECT p.title, p.rowid as projectid, t.label, t.rowid as taskid, u.rowid as userid, t.planned_workload, t.dateo, t.datee, SUM(tasktime.task_duration) as timespent";
$sql.=" FROM ".MAIN_DB_PREFIX."projet as p";
$sql.=" LEFT JOIN ".MAIN_DB_PREFIX."societe as s on p.fk_soc = s.rowid";