Table 1 create table person ( doc text primary key, etc .... city text ); 90000 rows create table sales ( doc text, etc ..... ); 300000 rows select p.city,count(*) from sales s, person p where s.doc = p.doc group by p.city; Anyone help-me?
pgsql-sql by date:
Соглашаюсь с условиями обработки персональных данных