PARAMETERS of Multiple values

Question

ok i have a field called Country and a field called city. I have a function that calculates the total Population of the country based on the number of people in each city. But for the sake of testing the function i made country = America. But there are many countries. how do i parse through my function which is
total_pop_country(p_country IN world.country%TYPE, v_city IN world.city%TYPE, v_pop IN world.pop%TYPE)
i have made as i said p_country = 'America' for testing puposes.
but how do i parse in the Country field into it when there are multiple countries with diferrent names.
does the function know to seperate each country
my table of data looks similar to this
COUNTRY CITY POP
AMERICA BOSTON 100000
AMERICA NEW YORK 233442
AMERICA WASHINGTON 112121
AUSTRALIA SYDNEY 128291
AUSTRALIA PERTH 1232132
CHINA ......etc

Answer 1

Hi,
In a SQL statement inside a PL/SQL routine, you can use a variable any place where a literal is allowed. For example, if you can say:
SELECT  SUM (pop)
INTO    v_pop
FROM   world
WHERE   country = 'America'; -- Literalthen you can also say:
SELECT  SUM (pop)
INTO    v_pop
FROM   world
WHERE   country = p_country; -- VariableMake sure there's no column that has the same name as your variable (p_country, in the example above).
If that's not the problem, could you give more details? For example:
I want a function I can call like this: ...
that, with the data I posted earlier, will give these results: ...
I wrote this function: ...
But it's not right when ...