--WBS_TASK_STRING   ACTIVITY_ID FROM_DATE       TO_DATE         #OCCURENCES
/* SQL STATEMENT
select wbs_task_string, activity_id, from_date,to_date, count(*) occurences from wbs_task
where activity_id is not null
group by wbs_task_string, activity_id, from_date,to_date
having count(*) > 1
order by 1;
*/