join - SQL Query For These Two Tables -

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i have these 2 tables:

person

name    gender  regionid bob     male    1 mary    female  2 jane    female  3 chris   male    1 paul    male    2 matt    male    2 jenny   female  1

region

id  region   1   north    2   south    3   central

i end table this:

region  male    female north   2       1 south   2       1 central 0       1

i first tried resulting table region's id in there no join required:

select regionid, gender, count(name) person group regionid

but gender field coming undefined. , didn't know go there.

as tagged, i'm using alasql javascript library.

try @ this:

select a.region     , sum(case when gender = 'male' 1 else 0 end) male     , sum(case when gender = 'female' 1 else 0 end) female region inner join person b on a.id = b.regionid group a.region

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