Name of column to function

Question

Can I refer name of column to function oblicz pasted below?
How can I do this?
nazwa - name of column from table pracownicy witch some float variables
PS:thanks 4 every help.
Greets Mike.
------begin function-----
create or replace function oblicz (nazwa varchar)
return number
is
l number(2);
begin
select avg('nazwa') <----- in here!
into l
from pracownicy;
return l;
end;
--------end function--------
Message was edited by:
axis_81

Answer 1

Aren't the two exactly the same? No:
declare
  l number(2);
begin
  execute immediate 'select avg(empno) into :1 from emp' using l;
end;
Error at line 2
ORA-01745: invalid host/bind variable name
ORA-06512: at line 4
or
declare
  l number(2);
begin
  execute immediate 'select avg(empno) into :l from emp' using l;
end;
Error at line 2
ORA-01006: bind variable does not exist
ORA-06512: at line 4