Hi all,
I´ve got a strange problem, hope you could help. I´ve got a table (a ) with
n tuples, and two fields , birthplace and birth date. There´s another table (
say b) with m tuples, where i´ve got a lot of polygons ( with their code, same
as bithplace). Now i want to make a join, to obtain how many people corresponds
to each place-polygon. I write
create table personsbyplace as select a.birthplacecode as code,count(*) as
peoplecount from a,b where
a.birthplacecode=b.polygoncode group by birthplacecode
Well, what i can´t understand is why "Select sum(count) from personsbyplace" is
> than "a" row number! (n)
In "b" i´ve got all places and "a" table is a list of people, with their place
and birth date. It can´t be greater sum(count) than number of persons! Where is
the mistake?
Thanks in advance,
Gus
