sql - Overall summary with multiple GROUP BY -


lets have table called census following information:

country     province    city        population ============================================== usa         california  sacramento  1234 usa         california  sanfran     4321 usa         texas       houston     1111 usa         texas       dallas      2222 canada      ontario     ottawa      3333 canada      manitoba    winnipeg    4444

i'm building report @ country/province level, gives me following:

select country, province, sum(population) census group country, province;  country     province    sum(population) ======================================= usa         california  5555 usa         texas       3333 canada      ontario     3333 canada      manitoba    4444

i'm looking have "overall summary" row included on report, final result looks like:

country     province    sum(population) ======================================= usa         california   5555 usa         texas        3333 canada      ontario      3333 canada      manitoba     4444 total                   16665

i'm acquainted rollups, can't seem find combination gets me i'm looking for. using group rollup(country, province) includes total value want, includes large number of values don't care about. true group rollup(country), province

how can go making "total" record?
i'm calculating union all , repeating 90% of first query different group by, because first query non-trivial, result slow , ugly code.

here's sql fiddle want play this: http://sqlfiddle.com/#!4/12ad9/5

this grouping sets expressions designed do:

select country, province, sum(population) census group grouping sets    ( (country, province),        -- first group country , province      ()                          -- (nothing), i.e. total grouping    );

see sql-fiddle


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