Question : custom rollup

I provide the code to create table test and data and s select statement. I like the select result
not to include NY for USA. So, the USA sum(population) will be 700 insstead of 1100. Everything else remain the same. Thanks.

COUNTRY STATE CITY SUM(POPULATION)
---------- ---------- ---------- ---------------
USA CA LA 400
USA CA 400
USA NY NY 300
USA NY BAFFALO 100
USA NY 400
USA TX DALLAS 100
USA TX HOUSTON 200
USA TX 300
USA 700
700

create table test (country varchar2(10), state varchar2(10), city varchar2(10), population number);

SET DEFINE OFF;
Insert into TEST (COUNTRY, STATE, CITY, POPULATION) Values ('USA', 'TX', 'DALLAS', 100);
Insert into TEST (COUNTRY, STATE, CITY, POPULATION) Values ('USA', 'TX', 'HOUSTON', 200);
Insert into TEST (COUNTRY, STATE, CITY, POPULATION) Values ('USA', 'NY', 'NY', 300);
Insert into TEST (COUNTRY, STATE, CITY, POPULATION) Values ('USA', 'NY', 'BAFFALO', 100);
Insert into TEST (COUNTRY, STATE, CITY, POPULATION) Values ('USA', 'CA', 'LA', 400);
COMMIT;

SELECT country,state, city, sum(population) FROM test GROUP BY ROLLUP(country,state, city);

Answer : custom rollup

oops,

                       
             SELECT country, state, city, DECODE(grp, 0, all_sum, 1, no_ny_sum)
  FROM (  SELECT country,
                 state,
                 city,
                 GROUPING(state) grp,
                 SUM(population) all_sum,
                 SUM(CASE WHEN state != 'NY' THEN population END) no_ny_sum
            FROM test
        GROUP BY ROLLUP(country, state, city))

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