Pleasse help me with this subquery

Question

HI all,
I,ve a question.I,ve 2 tables.one has to do with jobs where there are many duties.(see table 1).The other table has to do with jobseekers where they want specific dutie(see table 2)
table 1"jobs"
job_id duties compagny
1 wash dishes kersten
1 sell Kersten
2 cook burger king
2 clean burger king
table 2"jobseekers"
jobseeker_id duties name
1 clean caroline
1 sell caroline
2 cook reena
2 wash dishes caroline
The output has to be this
dutienr dutie compagny jobseekername
1 clean Kersten Caroline
2 sell Kersten Caroline
1 cook burger king Reena
2 wash dishes burger king Caroline
The idea is that I must write a subquerie
which will find all the jobseekers with the same dutie as wich the job ask for
select jobseekers_id,jobseekersname,dutie from jobseekers where duties in (select duties from jobs where compagny ="kersten')
But I have to split the duties like the output above and I don't know how to do that.
Can someone pleasse help me.
Caroline

Answer 1

Caroline wrote:
which will find all the jobseekers with the same dutie as wich the job ask forBased on what you say there...
This sounds like you have companies that are requesting jobseekers who can do all the duties that they require. So kersten requires someone who can do both "wash dishes" and "sell" and burger king require someone who can do both "cook" and "clean".
If I expand the jobseekers data a little, this can be shown as follows...
SQL> with jobs as (select 1 as job_id, 'wash dishes' as duties, 'kersten' as compagny from dual union all
  2                select 1, 'sell', 'kersten' from dual union all
  3                select 2, 'cook', 'burger king' from dual union all
  4                select 2, 'clean', 'burger king' from dual)
  5      ,jobseekers as (select 1 as jobseeker_id, 'clean'as duties, 'caroline' as name from dual union all
  6                      select 1, 'sell', 'caroline' from dual union all
  7                      select 2, 'cook', 'reena' from dual union all
  8                      select 2, 'clean', 'reena' from dual union all
  9                      select 2, 'cook', 'caroline' from dual union all
10                      select 1, 'wash dishes', 'caroline' from dual)
11  -- end of sample data
12  select jobs.compagny, jobs.duties, jobseekers.name
13  from jobs, jobseekers
14     , (select compagny, count(*) cnt from jobs group by compagny) jobs2 -- the number of duties required by the compagny
15     , (select compagny, name, count(*) cnt from jobs, jobseekers where jobs.duties = jobseekers.duties group by compagny, name) jobseekers2 -- the number of skills each jobseeker has for each compagny
16  where jobs2.compagny = jobs.compagny
17  and   jobseekers2.compagny = jobs.compagny
18  and   jobseekers2.name = jobseekers.name
19  and   jobseekers2.cnt = jobs2.cnt          -- pick the person if they can do all the duties the compagny requires
20  and   jobs.duties = jobseekers.duties
21  order by compagny, name, duties
22  /
COMPAGNY    DUTIES      NAME
burger king clean       caroline
burger king cook        caroline
burger king clean       reena
burger king cook        reena
kersten     sell        caroline
kersten     wash dishes caroline
6 rows selected.
SQL>So, from my test data, caroline and reena can both do cooking and cleaning so they could both work at burger king, but only caroline can do selling and washing dishes so is the only one suitable for kersten.
Is that a little closer to what you are after?