java - How to select the field value if field in all child records are the same -

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i don't know if i'm wording question correctly, here goes.

this web application using java, oracle, hibernate.

i have 2 tables in 1 (items) many (tasks) relationship.

items

  • item_id name
  • active_status
  • etc

tasks

  • task_id
  • item_id
  • active_status
  • progress_status
  • etc

the item's status made of statuses of of tasks. here's logic...

  • if item status canceled or on hold...return item active status
  • if there no tasks, return completed
  • if tasks active , not superseded, then
  • ...return not started if tasks not started
  • ...return completed if tasks completed
  • ...return on hold if tasks on hold
  • otherwise return started

i want using sql , map field in hibernate mapping file.

i've tried many things on past several days, , can't seem work. tried grouping records , if 1 record found, return status. i've used decode, case, etc.

here few examples of things i've tried. in second example 'not single group group function' error.

any thoughts?

select decode(i.active_status_id, 'oh', i.active_status_id, 'ca', i.active_status_id,t.progress_status_id)         tasks t          left outer join items                 on i.item_id = t.item_id         t.item_id = 10927815 , t.active_status_id = 'ac' , t.active_status_id != 'su'          group i.active_status_id, t.progress_status_id;     select case                                  when (count(*) = 1) progress_status_id         else 'st'         end                  (select progress_status_id                 tasks t                          t.item_id = 10927815 , (t.active_status_id = 'ac' , t.active_status_id != 'su') group t.progress_status_id)

perhaps somthing this

select    item_id , case      when active_status in ('canceled', 'on hold') active_status     when t_num = 0 'completed'     when flag_all_active = 1 , flag_all_not_started = 1 'not started'     when flag_all_active = 1 , flag_all_completed = 1 'completed'     when flag_all_active = 1 , flag_all_on_hold = 1 'on hold'   else 'started'   end (   select        i.item_id     , i.active_status     , sum(case when t.task_id null 0 else 1 end ) t_num     , min( case t.active_status when 'ac' 1 else 0 end ) flag_all_active      , min( case t.progress_status_id when 'not starten' 1 else 0 end ) flag_all_not_started     , min( case t.progress_status_id when 'completed' 1 else 0 end ) flag_all_completed     , min( case t.progress_status_id when 'on hold' 1 else 0 end ) flag_all_on_hold         items     left outer join tasks t on (t.item_id = i.item_id )   group i.item_id ) ;

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