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create table members(id int, name varchar(50), city varchar(50)); insert into members values(1, 'John' ,'Boston'); insert into members values(2, 'Maria' ,'Boston'); insert into members values(3, 'Steve' ,'London'); insert into members values(4, 'Oscar' ,'London'); insert into members values(5, 'Ben' ,'Singapore'); create table donations(member_id int, amount int); insert into donations values(1, 100); insert into donations values(1, 150); insert into donations values(2, 300 ); insert into donations values(3, 50); insert into donations values(3, 100); insert into donations values(3, 50); insert into donations values(4, 75); insert into donations values(5, 200);
13 rows affected
SELECT m.city, SUM(d.amount) as donations FROM members m LEFT JOIN donations d ON d.member_id = m.id GROUP BY m.city ORDER BY city;
city
donations
Boston
550
London
275
Singapore
200