Use the below query to show all task information (columns listed : taskid, title, Linked account, start date, due date, status, Description, Assigned to, Created by and Created time)
select td.taskid, ad.title, org.name as "Linked Account", longtodate(td.Starttime) as "Start Date", longtodate(td.Duebytime) as "Due Date", astat.Statusname as "Status", ad.description as "Description", aa.First_name as "Assigned to", aal.Name as "Created by", longtodate(ad.Createdtime) from taskdefinition td left join activitydefinition ad on td.Taskid=ad.Activityid left join customer_activity cact on ad.Activityid=cact.Activityid left join aaaorganization org on cact.Customer_id=org.Org_id left join activitystatus astat on td.Statusid=astat.statusid left join aaauser aa on td.Ownerid=aa.User_id left join aaalogin aal on ad.Createdby=aal.User_id