sql - Pass id to inner SELECT of nested query with ORDER BY and ROWNUM -

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i facing similar problem, i had couple of months ago: need return single value subquery may or may not return list of values. thus, apply order by first , select topmost entry where rownum=1 (yep, i'm on oracle).

the problem is, required id in inner query unknown due nesting.

last time, adviced use oracles analytic functions , apply min()/max(). time, however, i'm selecting currency symbol (varchar) , cannot utilize these functions.

any appreciated. relevant part of query:

select   myothercolumn,    (select currencysymbol (      select distinct p2.id, p2.validfromdate, curr.currencysymbol currencysymbol my_order_tablepos op2      join my_order_table o2 on op2.fk_order=o2.id      join my_price_table p2 on op2.fk_concretarticle=p2.fk_article      join my_currency_table curr on p2.fk_currency=curr.id      op2.fk_order=o.id , p2.id=( -- fails, since o.id unknown in inner query!        -- determine current price article        select max(p3.id) keep (dense_rank first order p3.mintoorder desc, p3.validfromdate desc) currentpriceid        my_price_table p3        p3.fk_article=op2.fk_concretarticle        , p3.validfromdate<=sysdate        , p3.mintoorder<=op2.amount      )      order p2.validfromdate desc   )   rownum=1) currencysymbol  ... o.id=786;

adding id inner query

select distinct p2.id, p2.validfromdate, curr.currencysymbol currencysymbol my_order_tablepos op2 join my_order_table o2 on op2.fk_order=o2.id join my_price_table p2 on op2.fk_concretarticle=p2.fk_article join my_currency_table curr on p2.fk_currency=curr.id op2.fk_order=786 , p2.id=( -- id set statically here  -- determine current price article  select max(p3.id) keep (dense_rank first order p3.mintoorder desc, p3.validfromdate desc) currentpriceid  my_price_table p3  p3.fk_article=op2.fk_concretarticle  , p3.validfromdate<=sysdate  , p3.mintoorder<=op2.amount ) order p2.validfromdate desc;

gets me result:

id     validfromdate                  currencysymbol 597    18.11.14 00:00:00,000000000    $ 556    10.11.14 10:54:05,973000000    € 552    10.11.14 10:44:25,719000000    € 258    15.10.14 10:12:01,670000000    €

my goal return currencysymbol of topmost entry (here: $).

so, question is: how can pass order id nested query or how can rewrite query such meets needs? know query overly complex, apologies that. :)

  (select currencysymbol (      select op2.fk_order, curr.currencysymbol currencysymbol,             row_number() over(partition op2.fk_order order p2.validfromdate desc) rw      my_order_tablepos op2          join my_order_table o2 on op2.fk_order=o2.id          join my_price_table p2 on op2.fk_concretarticle=p2.fk_article          join my_currency_table curr on p2.fk_currency=curr.id      p2.id=(        -- determine current price article        select max(p3.id) keep (dense_rank first order p3.mintoorder desc, p3.validfromdate desc) currentpriceid        my_price_table p3        p3.fk_article=op2.fk_concretarticle        , p3.validfromdate<=sysdate        , p3.mintoorder<=op2.amount      )   )   fk_order = o.id , rw=1) currencysymbol

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