How to find record having second highest salary

Question

Hello friends
I ve a table empsal
it has 2 columns name,salary
i need to find out name of employee with second highest salary.
how shud i ..pls help...
thks
sonal...

Answer 1

in the doc
create or replace type SecondMaxImpl as object
  max NUMBER, -- highest value seen so far
  secmax NUMBER, -- second highest value seen so far
  static function ODCIAggregateInitialize(sctx IN OUT SecondMaxImpl)
    return number,
  member function ODCIAggregateIterate(self IN OUT SecondMaxImpl,
    value IN number) return number,
  member function ODCIAggregateTerminate(self IN SecondMaxImpl,
    returnValue OUT number, flags IN number) return number,
  member function ODCIAggregateMerge(self IN OUT SecondMaxImpl,
    ctx2 IN SecondMaxImpl) return number
create or replace type body SecondMaxImpl is
static function ODCIAggregateInitialize(sctx IN OUT SecondMaxImpl)
return number is
begin
  sctx := SecondMaxImpl(0, 0);
  return ODCIConst.Success;
end;
member function ODCIAggregateIterate(self IN OUT SecondMaxImpl, value IN number) return number is
begin
  if value > self.max then
    self.secmax := self.max;
    self.max := value;
  elsif value > self.secmax then
    self.secmax := value;
  end if;
  return ODCIConst.Success;
end;
member function ODCIAggregateTerminate(self IN SecondMaxImpl,
    returnValue OUT number, flags IN number) return number is
begin
  returnValue := self.secmax;
  return ODCIConst.Success;
end;
member function ODCIAggregateMerge(self IN OUT SecondMaxImpl, ctx2 IN SecondMaxImpl) return number is
begin
  if ctx2.max > self.max then
    if ctx2.secmax > self.secmax then
      self.secmax := ctx2.secmax;
    else
      self.secmax := self.max;
    end if;
    self.max := ctx2.max;
  elsif ctx2.max > self.secmax then
    self.secmax := ctx2.max;
  end if;
  return ODCIConst.Success;
end;
end;
CREATE OR REPLACE FUNCTION SecondMax (input NUMBER) RETURN NUMBER
PARALLEL_ENABLE AGGREGATE USING SecondMaxImpl;
SELECT deptno,SecondMax(sal)
FROM emp
GROUP BY deptno;
    DEPTNO SECONDMAX(SAL)
        10           2450
        20           3000
        30           1600